Electrical apparatus for teaching arithmetic of multiple-choice answer type with multiplication table in a triangle form
IL54144A0Inactive Publication Date: 1978-04-30SHARONY J
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Patent Information
- Application Number
- IL54144
- Authority / Receiving Office
- IL · IL
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 1978-02-27
- Publication Date
- 1978-04-30
- Estimated Expiration
- Not applicable · inactive patent
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