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Base ten primary teaching kit

Education and demonstration – Mathematics – Base conversion or use of base other than ten
Reexamination Certificate

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Base ten primary teaching kit

Education and demonstration – Mathematics – Base conversion or use of base other than ten
Reexamination Certificate

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Base--ten blocks employing single, attachable blocks of one colo

Education and demonstration – Mathematics – Arithmetic
Patent

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Basic mathematics teaching and learning aid

Education and demonstration – Mathematics
Reexamination Certificate

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Bead calculator educational toy

Education and demonstration – Mathematics – Arithmetic
Patent

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Binary rotation teaching game

Education and demonstration – Mathematics – Base conversion or use of base other than ten
Reexamination Certificate

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Blocks with mating bosses and recesses which bulge for interfere

Education and demonstration – Mathematics – Arithmetic
Patent

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