Teaching clock

Details Teaching clock Teaching clock

1981-03-31

1983-07-19

Feifer, Melvin B.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D10125, D1907

Patent

active

D02697904

REFERENCES:
patent: D171958 (1954-04-01), Spooner
patent: 1759080 (1930-05-01), Youngblodt
patent: 2172450 (1939-09-01), Pitcher
patent: 2853804 (1958-09-01), Bengeyfield

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