Teaching clock

Details Teaching clock Teaching clock

1981-07-13

1984-05-15

Feifer, Melvin B.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

Patent

active

D02738732

REFERENCES:
patent: 2172450 (1939-09-01), Pitcher
patent: 2647330 (1953-08-01), Ford
patent: 3702507 (1972-11-01), Romey

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