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Abstract

To smoothly attach a label to a smooth part of a body part while ensuring the rigidity of the smooth part.SOLUTION: Multiple circumferential grooves 21 that extend continuously over the entire circumferential length are formed on the vertically extending body part 13 with vertical spacing, and multiple circumferentially extending concave ribs 23 are formed with circumferential spacing in a smooth portion 15a of the body part which is vertically adjacent to the circumferential grooves, and one rib row 24 consisting of multiple concave ribs spaced apart in the circumferential direction is provided in each smooth portion, and two or more rib rows are provided in the vertical direction on the body part with vertical spacing, and the spacing Y between adjacent concave ribs in the circumferential direction is located at the same circumferential position as at least a part of the concave rib of another rib row adjacent to the circumferential groove in the vertical direction.SELECTED DRAWING: Figure 1

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