Talking-teaching clock toy

Details Talking-teaching clock toy Talking-teaching clock toy

1990-02-06

1992-02-18

Rademaker, Charles A.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D21144

Patent

active

D03240754

REFERENCES:
patent: D204776 (1966-05-01), Appel et al.
patent: D215951 (1969-11-01), Arato et al.
patent: D272930 (1984-03-01), Anderson
patent: D309436 (1990-07-01), Zeiser

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