Electronic educational device

Details Electronic educational device Electronic educational device

1988-04-25

1991-01-29

Burke, Wallace R.

Office supplies; artists and teachers materials

Teaching material

Patent

active

D03142140

REFERENCES:
patent: D194537 (1963-02-01), Teeter
patent: D223026 (1972-02-01), Rotkow
patent: D225232 (1972-11-01), Arnold et al.
patent: D229418 (1973-11-01), Matsumoto
patent: D229420 (1973-11-01), Matsumoto
patent: D242247 (1976-11-01), Filer
patent: D247363 (1978-02-01), Hughes
patent: D247502 (1978-03-01), Hanson
patent: D255368 (1980-06-01), Boyd

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