Educational aids for the teaching of mathematics
IL49021A0Inactive Publication Date: 1976-04-30KIEFFER D
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Patent Information
- Application Number
- IL49021
- Authority / Receiving Office
- IL · IL
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 1976-02-12
- Publication Date
- 1976-04-30
- Estimated Expiration
- Not applicable · inactive patent
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