A 5G-based smart classroom question-answering interactive device
By designing a 5G-based Q&A interactive device in a smart classroom, using trigger recording mechanisms and screen recording transmission mechanisms, the problem of the inability to record students and teachers in the existing technology is solved, and the automatic recording and transmission of videos is realized, which promotes teaching review and improvement.
Patent Information
- Application Number
- CN202111522109.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2021-12-13
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2041-12-13
AI Technical Summary
The existing smart classrooms cannot effectively record the one-on-one question-and-answer sessions between students and teachers, making it difficult to view and review after class.
A smart classroom Q&A interactive device based on 5G is designed, including student desks, student seats and L-shaped support base plates, equipped with a trigger recording mechanism and a screen recording transmission mechanism, using the first and second webcams and recorders, Gravity sensing switches and electric telescopic rods automatically record the interactive videos between students and teachers, and transmit them to the recording computer and tablet computer through 5G network, making it easier for teachers and students to view subsequently.
It realizes automatic recording and transmission of one-on-one Q&A sessions between students and teachers in the classroom, which facilitates teachers and students to view after class, and promotes the review and improvement of teaching.
Smart Images

Figure CN114283636B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of smart classroom question-answering interaction technology, and specifically to a 5G-based smart classroom question-answering interaction device. Background Art
[0002] Smart classrooms use computer technology, network technology, communication technology and scientific and standardized management on campus to integrate, integrate and fully digitize all information resources related to learning, teaching, scientific research, management and life services in the classroom, so as to form unified user management, unified resource management and unified authority control. Nowadays, smart classrooms all rely on 5G networks to operate. Generally, smart classrooms only rely on cameras to record the classroom process, and cannot make targeted records of the one-on-one question-and-answer sessions between students and teachers. In this way, it is not convenient for teachers and students to check the corresponding situation after class. Summary of the invention
[0003] The purpose of the present invention is to provide a 5G-based smart classroom question-answering interactive device to solve the problems raised in the above-mentioned background technology.
[0004] To achieve the above object, the present invention provides the following technical solutions:
[0005] A 5G-based smart classroom question-answering interactive device includes: a student desk, a student chair and an L-shaped support base. The L-shaped support base is connected to the bottom of the student desk. The student chair spans the L-shaped support base, and there is no contact between the student chair and the L-shaped support base. A 5G-based smart classroom question-answering interactive device also includes: a trigger recording mechanism. The trigger recording mechanism includes: a storage cavity, a first electric telescopic rod, a recorder, a first network camera, a second network camera, a first gravity sensing switch, a second gravity sensing switch, a trigger switch group and a recording computer. The storage cavity is opened in the student desk. The upper end of the storage cavity is an opening. The first electric telescopic rod is connected to the storage cavity. The recorder is fixedly installed at the first electric telescopic rod. The first network camera is installed on the outside of the student desk. The second network camera is installed at the telescopic end of the first electric telescopic rod, and the recording computer is equipped with a display screen. The first network camera and the second network camera are both connected to the recording computer via a network. The first gravity sensing switch is installed at the bottom of the L-shaped support base, and the first gravity sensing switch is electrically connected to the first electric telescopic rod. The second gravity sensing switch is installed on the seat surface of the student seat, and the second gravity sensing switch is electrically connected to the first electric telescopic rod. The trigger switch group is connected to the storage cavity, and the trigger switch group is electrically connected to the first network camera and the second network camera.
[0006] As a further solution of the present invention: the trigger switch group includes: a horizontal push rod, a rotating plate, a start button switch and a reset spring. The horizontal push rod is connected to the telescopic end of the first electric telescopic rod. The rotating plate is movably connected to the storage cavity. The start button switch is installed on the rotating plate. And the start button switch is electrically connected to the first network camera, the second network camera, the recorder and the recording computer. The reset spring is horizontally connected in the storage cavity, and the reset spring is connected to the rotating plate through a soft rope.
[0007] As a further solution of the present invention, the trigger switch group further comprises: a pulley for the horizontal push rod to contact and start the sliding of the key switch. The pulley is mounted on the horizontal push rod.
[0008] As a further solution of the present invention: A 5G-based smart classroom question-answering interactive device also includes: a circuit breaker mechanism. The circuit breaker mechanism includes: a vertical top rod, a support block, a support spring, a first conductive sheet, and a second conductive sheet. The vertical top rod is connected to the horizontal top rod. The support block is connected to the fixed end of the first electric telescopic rod. The first conductive sheet is connected to the support block through a support spring. The second conductive sheet is fixedly connected to the support block. The first conductive sheet and the second conductive sheet are connected in series to the circuit connecting the first electric telescopic rod and the second gravity sensing switch.
[0009] As a further solution of the present invention: a closing cover is horizontally embedded in the opening of the storage cavity, and the closing cover is movably connected to the opening of the storage cavity.
[0010] As a further solution of the present invention: a 5G-based smart classroom question-answering interactive device further includes: a protective glass cover for protecting the first network camera. The protective glass cover is fixedly connected to the student desk, and the first network camera is inside the protective glass cover.
[0011] As a further solution of the present invention: A 5G-based smart classroom question-answering interactive device also includes: a screen recording transmission mechanism. The screen recording transmission mechanism includes: a second electric telescopic rod, a screen recording button, a transmission button, a top block, a tablet computer, a video transmitter and an installation cavity. The installation cavity is opened into the housing of the recording computer. The second electric telescopic rod is connected to the installation cavity. The screen recording button is installed at the inner bottom of the installation cavity, and the screen recording button is electrically connected to the recording computer. The video transmitter is electrically connected to the recording computer. The video transmitter is equipped with a data transmission connector. The tablet computer is equipped with a data transmission jack. The top block is fixedly connected to the telescopic end of the second electric telescopic rod. The transmission button is installed in the installation cavity. The transmission button is electrically connected to the video transmitter.
[0012] As a further solution of the present invention: the screen recording transmission mechanism further includes: an elastic rubber ball. The elastic rubber ball is fixedly connected to the telescopic end of the second electric telescopic rod.
[0013] As a further solution of the present invention: a 5G-based smart classroom question-answering interactive device further includes: a connection card sleeve for installing a tablet computer. The connection card sleeve is connected to a recording computer. The video transmitter is in the connection card sleeve.
[0014] As a further solution of the present invention: an elastic rubber block for firmly clamping the tablet computer is bonded to the inner wall of the connecting sleeve.
[0015] Compared with the prior art, the beneficial effects of the present invention are: it is convenient to separately record the one-on-one question-and-answer session between teachers and students in class, and it is convenient for teachers and students to review the summary after class.
[0016] The first and second webcams are mainly used to automatically start recording when students stand up to answer or ask questions during class, and the recorded videos are transmitted to the recording computer on the podium through the network, and are also transmitted to the tablet computer equipped by the teacher separately, so that the teacher can check the performance of students participating in the question-and-answer session and the academic problems they dealt with at that time after class, so as to facilitate review and subsequent improvement. At the same time, students can also view them through the recording computer on the podium.
[0017] Other features and advantages of the present invention will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is a structural schematic diagram of a 5G-based smart classroom question-answering interactive device of the present invention.
[0019] Figure 2 for Figure 1 Schematic diagram of the enlarged structure at point A in the middle.
[0020] Figure 3 for Figure 1 A structural schematic diagram of the connection between a recording computer and a screen recording transmission mechanism of a 5G-based smart classroom question-answering interactive device of the present invention.
[0021] Figure 4 for Figure 3 A top view structural diagram of a connection card sleeve of a 5G-based smart classroom question-answering interactive device of the present invention.
[0022] Figure 5 for Figure 1 A right-view structural schematic diagram of a 5G-based smart classroom question-answering interactive device in which a student seat is connected to an L-shaped supporting base plate.
[0023] List of reference numerals: A 5G-based smart classroom question-answering interactive device 100; student desk 10; student chair 20; L-shaped support base plate 30; trigger recording mechanism 40; storage cavity 41; closing cover 411; first electric telescopic rod 42; recorder 43; first network camera 44; second network camera 45; first gravity sensing switch 46; second gravity sensing switch 47; trigger switch group 48; horizontal top rod 481; rotating plate 482; start button switch 483; reset spring 484; Pulley 485; recording computer 49; display screen 491; circuit breaker mechanism 50; vertical push rod 51; support block 52; support spring 53; first conductive sheet 54; second conductive sheet 55; protective glass cover 60; screen recording transmission mechanism 70; second electric telescopic rod 71; screen recording button 72; transmission button 73; push block 74; tablet computer 75; data transmission jack 751; video transmitter 76; data transmission connector 761; installation cavity 77; elastic rubber ball 78; connecting sleeve 80; elastic rubber block 81. DETAILED DESCRIPTION
[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0025] like Figures 1 to 5As shown, in an embodiment of the present invention, a 5G-based smart classroom question-answering interactive device 100 includes: a student desk 10, a student chair 20 and an L-shaped support base 30. The L-shaped support base 30 is fixedly connected to the bottom of the student desk 10. The student chair 20 spans the front-to-back direction of the upper side of the L-shaped support base 30, and there is no contact between the student chair 20 and the L-shaped support base 30. A 5G-based smart classroom question-answering interactive device 100 also includes: a trigger recording mechanism 40. The trigger recording mechanism 40 includes: a storage cavity 41, a first electric telescopic rod 42, a recorder 43, a first network camera 44, a second network camera 45, a first gravity sensing switch 46, a second gravity sensing switch 47, a trigger switch group 48 and a recording computer 49. The storage cavity 41 is opened inside the left side of the student desk 10. The upper left side of the storage cavity 41 is an opening. The first electric telescopic rod 42 is vertically fixedly connected to the left side of the inner bottom of the storage cavity 41. The telescopic end of the first electric telescopic rod 42 is aligned with the opening of the storage cavity 41. The telescopic end of the first electric telescopic rod 42 is convenient for telescoping in the vertical direction and convenient for passing through the opening of the storage cavity 41. The recorder 43 is fixedly installed at the upper end of the first electric telescopic rod 42, and the recorder 43 is used to record the live sound. The first network camera 44 is installed outside the upper left end of the student desk 10. The second network camera 45 is installed on the left side of the telescopic end of the first electric telescopic rod 42. The first network camera 44 faces the position where the students sit, and the second network camera 45 is aimed at the teacher's podium position, that is, the first network camera 44 is used to shoot students, and the second network camera 45 is used to shoot the teacher's podium position. The first network camera 44 and the second network camera 45 are both cameras based on the 5G network. The recorder 43 is connected to the first network camera 44 and the second network camera 45, that is, the recorder 43 is the original sound receiving component of the first network camera 44 and the second network camera 45. The recording computer 49 is installed at the teacher's podium, and the recording computer 49 is equipped with a display screen 491. The first network camera 44 and the second network camera 45 are both connected to the recording computer 49 via a 5G network. The first gravity sensing switch 46 is installed on the horizontal plate end surface at the bottom of the L-shaped support base plate 30, and the first gravity sensing switch 46 is electrically connected to the extension control circuit of the first electric telescopic rod 42. The second gravity sensing switch 47 is installed on the seat surface of the student chair 20, and the second gravity sensing switch 47 is electrically connected to the contraction control circuit of the first electric telescopic rod 42. The trigger switch group 48 is connected to the storage cavity 41, and the trigger switch group 48 is electrically connected to the first network camera 44 and the second network camera 45.
[0026] During class, the devices on all the student desks 10 in the entire classroom are put into an operational state. When a student is sitting on a student chair 20 for class, if the teacher calls a student to stand up and answer a question, the student will stand up from the student chair 20. After standing up, the whole person will stand directly on the horizontal bottom plate of the L-shaped support bottom plate 30, and then the first gravity sensing switch 46 will generate induction and make the first electric telescopic rod 42 in the student desk 10 at the current position start to extend upward 2. Then the first electric telescopic rod 42 will extend the recorder 43 and the second network camera 45 from the storage cavity 41. At the same time, during the extension process, the trigger switch group 48 is triggered in linkage, so that the first network camera 44, the second network camera 45, the recorder 43 and the recording computer 49 are all started. The first network camera 44 will shoot the student who stands up to answer the question. The second network camera 45 shoots at the teacher's podium position, and the recorder 43 records the real-time sound, thereby realizing the recording of the one-to-one question and answer session between the teacher and the student. The recorded video is transmitted to the recording computer 49 through the network for storage and displayed on the display screen 491. It is convenient for teachers to directly view the performance of students participating in the question-and-answer session and the academic problems they dealt with at the time through the video after class, so as to facilitate review and subsequent improvement.
[0027] The trigger switch group 48 includes: a horizontal push rod 481, a rotating plate 482, a start button switch 483 and a return spring 484. The horizontal push rod 481 is horizontally fixedly connected to the right side of the telescopic end of the first electric telescopic rod 42. The rotating plate 482 is connected to the upper right inner wall of the storage chamber 41 through a hinge tilting movement. The start button switch 483 is installed on the end surface of the rotating plate 482 that tilts downward. And the start button switch 483 is electrically connected to the first network camera 44, the second network camera 45, the recorder 43 and the recording computer 49. The return spring 484 is horizontally connected to the upper right inner wall of the storage chamber 41, and the left end of the return spring 484 is connected to the rotating plate 482 through a soft rope. When the first electric telescopic rod 42 starts to extend upward, the horizontal push rod 481 rises upward accordingly. After rising, the end of the horizontal push rod 481 contacts the rotating plate 482, causing the rotating plate 482 to rotate in the direction of compressing the return spring 484. Then the return spring 484 pushes the rotating plate 482 by its rebound force, causing the start button switch 483 on the rotating plate 482 to contact the horizontal push rod 481 and keep it in the on state, so that the first network camera 44, the second network camera 45, the recorder 43 and the recording computer 49 can be powered on and operated.
[0028] The trigger switch assembly 48 further includes a pulley 485 for the horizontal push rod 481 to contact and slide the start button switch 483. The pulley 485 is mounted to the end of the horizontal push rod 481.
[0029] A 5G-based smart classroom question-answering interactive device 100 also includes: a circuit breaker mechanism 50. The circuit breaker mechanism 50 includes: a vertical top rod 51, a support block 52, a support spring 53, a first conductive sheet 54, and a second conductive sheet 55. The vertical top rod 51 is vertically fixedly connected to the lower side of the horizontal top rod 481. The support block 52 is horizontally fixedly connected to the outer wall of the fixed end of the first electric telescopic rod 42. The first conductive sheet 54 is connected to the upper side of the support block 52 through the support spring 53. The second conductive sheet 55 is fixedly connected to the upper side of the right end of the support block 52. The first conductive sheet 54 and the second conductive sheet 55 are connected in series to the contraction control circuit connected to the first electric telescopic rod 42 and the second gravity sensing switch 47 through a wire. When the first electric telescopic rod 42 is in a contracted state, the vertical top rod 51 contacts the first conductive sheet 54, causing the support spring 53 to compress. At this time, the first conductive sheet 54 and the second conductive sheet 55 are in a separated state, that is, the control circuit between the second gravity sensing switch 47 and the first electric telescopic rod 42 is disconnected. Therefore, even if the student sits on the student chair 20, the second gravity sensing switch 47 still cannot generate an electrical signal. Only when the student stands up to answer a question, causing the first electric telescopic rod 42 to extend, the contraction control circuit of the first electric telescopic rod 42 can be connected, so that the student can retract and reset when sitting down.
[0030] A closed cover 411 is horizontally embedded at the opening of the storage chamber 41. The closed cover 411 is movably connected to the opening edge of the storage chamber 41 through a rebound hinge. The closed cover 411 is used to close the opening of the storage chamber 41 to prevent external debris from entering. It can only be pushed open when the first electric telescopic rod 42 is extended.
[0031] A 5G-based smart classroom question-answering interactive device 100 also includes: a protective glass cover 60 for protecting the first network camera 44. The protective glass cover 60 is fixedly connected to the student desk 10, and the first network camera 44 is in the protective glass cover 60.
[0032] A 5G-based smart classroom question-answering interactive device 100 also includes: a screen recording transmission mechanism 70. The screen recording transmission mechanism 70 includes: a second electric telescopic rod 71, a screen recording button 72, a transmission button 73, a top block 74, a tablet computer 75, a video transmitter 76 and an installation cavity 77. The installation cavity 77 is opened into the housing of the recording computer 49. The second electric telescopic rod 71 is vertically fixedly connected to the inner top of the installation cavity 77. The screen recording button 72 is installed at the inner bottom of the installation cavity 77, and the screen recording button 72 is electrically connected to the screen recording module of the recording computer 49. The extension control circuit of the second electric telescopic rod 71 is electrically connected to the first gravity sensing switch 44. The contraction control circuit of the second electric telescopic rod 71 is electrically connected to the second gravity sensing switch 44. And the circuit between the second electric telescopic rod 71 and the second gravity sensing switch 44 is also connected to the circuit breaker mechanism 50. The video transmitter 76 is electrically connected to the recording computer 49, and the video transmitter 76 is used to transmit the video recorded and stored by the recording computer 49 to the outside. The video transmitter 76 is provided with a data transmission connector 761. Each teacher is provided with one tablet computer 75. The tablet computer 75 is provided with a data transmission jack 751. The top block 74 is fixedly connected to the telescopic end of the second electric telescopic rod 71. The transmission button 73 is installed on the inner top of the installation cavity 77, and the transmission button 73 and the top block 74 are aligned up and down. The transmission button 73 is electrically connected to the video transmitter 76. When the teacher is in class, the tablet computer 75 carried is plugged together through the data transmission jack 751 and the data transmission jack 751 on the video transmitter 76 to achieve the connection between the tablet computer 75 and the recording computer 49. When a student stands up to answer a question, the first gravity sensing switch 44 causes the second electric telescopic rod 71 to extend downward and contact the screen recording button 72. The screen recording button 72 causes the recording computer 49 to record the screen displayed by the current first network camera 44 and the second network camera 45, and save it. When the student finishes answering the question and sits down, the second gravity sensor switch 47 causes the second electric telescopic rod 71 to retract and reset, and then the top block 74 contacts the transmission button 73. Then the transmission button 73 causes the video transmitter 76 to operate, and transmits the recorded video to the tablet computer 75, so that the teacher can take the tablet computer 75 away after class, so as to facilitate the subsequent review.
[0033] The screen recording transmission mechanism 70 further includes an elastic rubber ball 78 . The elastic rubber ball 78 is fixedly connected to the telescopic end of the second electric telescopic rod 71 . The elastic rubber ball 78 is easily deformed when in contact, so as to buffer the squeezing force of the second electric telescopic rod 71 on the screen recording button 72 .
[0034] A 5G-based smart classroom question-answering interactive device 100 also includes: a connection card sleeve 80 for installing a tablet computer 75. The connection card sleeve 80 is connected to the recording computer 49. The video transmitter 76 is in the connection card sleeve 80.
[0035] An elastic rubber block 81 for firmly clamping the tablet computer 75 is bonded to the inner wall of the connecting sleeve 80 .
[0036] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.
[0037] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
Claims
1. A 5G-based smart classroom question-answering interactive device, comprising: Student desks, student chairs and an L-shaped support base; the L-shaped support base is connected to the bottom of the student desk; The student chair spans across the L-shaped support base, and there is no contact between the student chair and the L-shaped support base; it is characterized in that the 5G-based smart classroom question-answering interactive device also includes: a trigger recording mechanism; the trigger recording mechanism includes: a storage cavity, a first electric telescopic rod, a recorder, a first network camera, a second network camera, a first gravity sensing switch, a second gravity sensing switch, a trigger switch group and a recording computer; the storage cavity is opened in the student desk; the upper end of the storage cavity is an opening; the first electric telescopic rod is connected to the storage cavity; the recorder is fixedly installed at the first electric telescopic rod; the first network camera is installed on the student desk The first network camera is installed on the outside of the student desk; the second network camera is installed at the telescopic end of the first electric telescopic rod, and the recording computer is equipped with a display screen; the first network camera and the second network camera are both connected to the recording computer through a network; the first gravity sensing switch is installed at the bottom of the L-shaped support base plate, and the first gravity sensing switch is electrically connected to the first electric telescopic rod; the second gravity sensing switch is installed on the seat surface of the student chair, and the second gravity sensing switch is electrically connected to the first electric telescopic rod; the trigger switch group is connected to the storage cavity, and the trigger switch group is electrically connected to the first network camera and the second network camera; The trigger switch group includes: a horizontal push rod, a rotating plate, a start button switch and a reset spring; the horizontal push rod is connected to the telescopic end of the first electric telescopic rod; the rotating plate is movably connected to the storage cavity; the start button switch is installed on the rotating plate; and the start button switch is electrically connected to the first network camera, the second network camera, the recorder and the recording computer; the reset spring is horizontally connected in the storage cavity, and the reset spring is connected to the rotating plate through a soft rope; The 5G-based smart classroom question-answering interactive device also includes: a circuit breaker mechanism; the circuit breaker mechanism includes: a vertical top rod, a support block, a support spring, a first conductive sheet and a second conductive sheet; the vertical top rod is connected to the horizontal top rod; the support block is connected to the fixed end of the first electric telescopic rod; the first conductive sheet is connected to the support block through the support spring; the second conductive sheet is fixedly connected to the support block; the first conductive sheet and the second conductive sheet are connected in series to the circuit connecting the first electric telescopic rod and the second gravity sensing switch; The 5G-based smart classroom question-answering interactive device also includes: a screen recording transmission mechanism; the screen recording transmission mechanism includes: a second electric telescopic rod, a screen recording button, a transmission button, a top block, a tablet computer, a video transmitter and an installation cavity; the installation cavity is opened into the shell of the recording computer; the second electric telescopic rod is connected to the installation cavity; the screen recording button is installed at the inner bottom of the installation cavity, and the screen recording button is electrically connected to the recording computer; the video transmitter is electrically connected to the recording computer; the video transmitter is equipped with a data transmission connector; the tablet computer is equipped with a data transmission jack; the top block is fixedly connected to the telescopic end of the second electric telescopic rod; the transmission button is installed in the installation cavity; the transmission button is electrically connected to the video transmitter.
2. According to a 5G-based smart classroom question-answering interactive device according to claim 1, it is characterized in that: The trigger switch group further includes: a pulley for the horizontal push rod to contact the start button switch to slide; the pulley is installed on the horizontal push rod.
3. According to a 5G-based smart classroom question-answering interactive device according to claim 1, it is characterized in that: A closing cover is horizontally embedded in the opening of the storage cavity; the closing cover is movably connected to the opening of the storage cavity.
4. According to a 5G-based smart classroom question-answering interactive device according to claim 1, it is characterized in that: The 5G-based smart classroom question-answering interactive device also includes: a protective glass cover for protecting the first network camera; the protective glass cover is fixedly connected to the student desk, and the first network camera is located inside the protective glass cover.
5. According to a 5G-based smart classroom question-answering interactive device according to claim 1, it is characterized in that: The screen recording transmission mechanism also includes: an elastic rubber ball; the elastic rubber ball is fixedly connected to the telescopic end of the second electric telescopic rod.
6. The 5G-based smart classroom question-answering interactive device according to claim 1, characterized in that: The 5G-based smart classroom question-answering interactive device also includes: a connecting card sleeve for installing the tablet computer; the connecting card sleeve is connected to the recording computer; and the video transmitter is inside the connecting card sleeve.
7. A 5G-based smart classroom question-answering interactive device according to claim 6, characterized in that: An elastic rubber block for firmly clamping the tablet computer is bonded to the inner wall of the connecting sleeve.
Citation Information
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