Rack for holding cards used in teaching mathematics

Details Rack for holding cards used in teaching mathematics Rack for holding cards used in teaching mathematics

1985-04-01

1987-09-15

Feifer, Melvin B.

Games, toys, and sports goods

Toy

Representation or scale model

D19 90, D 6468, D 6474

Patent

active

D02919001

REFERENCES:
patent: D55077 (1920-05-01), Page
patent: D282989 (1986-03-01), Nelson
patent: 1955340 (1934-04-01), McPherson
patent: 2763485 (1956-09-01), Dial

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