Coin and number teaching aid

Details Coin and number teaching aid Coin and number teaching aid

1976-04-15

1978-03-14

Feifer, Melvin B.

Office supplies; artists and teachers materials

Teaching material

D1907

Patent

active

D02475022

REFERENCES:
patent: 2434553 (1948-01-01), Ensley
patent: 2672977 (1954-03-01), Seitz

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