Digital/analog teaching clock

Details Digital/analog teaching clock Digital/analog teaching clock

1995-09-14

1997-02-11

Lucas, Susan J.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D10 1

Patent

active

D03779491

REFERENCES:
patent: 2631386 (1953-03-01), Zalkind
patent: 3295312 (1967-01-01), Mutting et al.
Beckley-Candy Catalog, p. 135 Jan. 1994. Clocks on Lower Half of Page.

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