Electronic teaching aid

Details Electronic teaching aid Electronic teaching aid

1981-12-14

1984-01-24

Feifer, Melvin B.

Office supplies; artists and teachers materials

Teaching material

Sensory feedback, e.g., audio-visual teaching machine

D1907

Patent

active

D02723662

REFERENCES:
patent: 1860895 (1932-05-01), Marx
patent: 4164078 (1979-08-01), Goldfarb
Montgomery Ward Xmas Cat., 1980, p. 429, upper left, item C, "Major Morgan".

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