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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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Binary rotation teaching game

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

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Didactic aid for the teaching of any number system

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

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Didactic game based on selection of the trajectories followed by

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

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Educational device for demonstrating nonstandard counting proced

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

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Magnetic apparatus for demonstration of binary numbers

Education and demonstration – Mathematics – Base conversion or use of base other than ten
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Mathematics teaching device

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