Apparatus for indicating numerical concepts

Details Apparatus for indicating numerical concepts Apparatus for indicating numerical concepts

1977-10-14

1979-12-18

Feifer, Melvin B.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D1907

Patent

active

D02537095

REFERENCES:
patent: 4015346 (1977-04-01), Ogasawara
Sears Xmas Cat., 1964, p. 195, middle left, Cackling Hen.

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