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Device and method for teaching mathematical properties...

Education and demonstration – Mathematics – Arithmetic
Reexamination Certificate

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Device for teaching decimal math

Education and demonstration – Mathematics – Arithmetic
Patent

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Didactic-educational toy for elementary arithmetic operations, r

Education and demonstration – Mathematics – Arithmetic
Patent

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Die having magic squares

Education and demonstration – Mathematics – Arithmetic
Patent

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Display polyhedra having marked and unmarked paired opposing fac

Education and demonstration – Mathematics – Arithmetic
Patent

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Double-beam math balance

Education and demonstration – Mathematics – Arithmetic
Reexamination Certificate

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