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Measurement system apparatus and method of teaching units of...

Education and demonstration – Measurement of length or volume
Reexamination Certificate

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Measurement system apparatus and method of teaching units of...

Education and demonstration – Measurement of length or volume
Reexamination Certificate

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Method and apparatus for teaching fractions

Education and demonstration – Measurement of length or volume
Patent

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Metric block toy

Education and demonstration – Measurement of length or volume
Patent

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Metric system teaching/playing cards

Education and demonstration – Measurement of length or volume
Patent

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