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Factor blocks kit and method of use

Education and demonstration – Mathematics – Arithmetic
Patent

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Finger arithmetic device

Education and demonstration – Mathematics – Arithmetic
Patent

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Flexible planar apparatus

Education and demonstration – Mathematics – Arithmetic
Patent

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For two-stage Quincunx

Education and demonstration – Mathematics
Patent

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Four-pan algebra balance having an imbalance correction mechanis

Education and demonstration – Mathematics – Arithmetic
Patent

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Fractal mathematics kit

Education and demonstration – Mathematics – Arithmetic
Patent

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Fraction circle

Education and demonstration – Mathematics – Arithmetic
Reexamination Certificate

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Fractional-arithmetic-teaching game and method for playing

Education and demonstration – Mathematics – Arithmetic
Patent

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