Educational clock apparatus

Details Educational clock apparatus Educational clock apparatus

1978-10-10

1980-09-09

Feifer, Melvin B.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D1907

Patent

active

D02568071

REFERENCES:
patent: D132975 (1942-07-01), Jones
patent: D242344 (1976-11-01), Klepsch

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