Counting toy

Details Counting toy Counting toy

1988-05-23

1991-01-08

Rademaker, Charles A.

Office supplies; artists and teachers materials

Teaching material

D21 59, D21103

Patent

active

D03136280

REFERENCES:
patent: D159034 (1950-06-01), Young
patent: D166791 (1952-05-01), Biever
patent: D197656 (1964-03-01), Markham
patent: 2020562 (1935-11-01), Miller

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