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Class Information
Number: 434/204
Name: Education and demonstration > Mathematics > Arithmetic > Apertured elements threaded on elongate means (e.g., abacus, etc.) > Elements manually placed on or removed from elongate means during use
Description: Subject matter wherein the apertured pieces are placed by hand on the wire, rod, or like means during instruction of a student.










Patents under this class:

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5176521 Educational apparatus with interchangeable task assigning template Jan. 5, 1993
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