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Rectangular blocks for teaching arithmetic have uniform size joi

Education and demonstration – Mathematics – Arithmetic
Patent

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Reward based game and teaching method and apparatus...

Education and demonstration – Mathematics – Arithmetic
Reexamination Certificate

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Rhymes tables math expertise system

Education and demonstration – Mathematics
Reexamination Certificate

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Rotatable disk teaching apparatus

Education and demonstration – Mathematics – Arithmetic
Patent

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Rotating pie graph: mathematics learning tool

Education and demonstration – Mathematics – Arithmetic
Patent

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Rotational educational apparatus

Education and demonstration – Mathematics – Arithmetic
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Row of joined arithmetic blocks with common walls which are doub

Education and demonstration – Mathematics – Arithmetic
Patent

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