Electronic studying machine

Details Electronic studying machine Electronic studying machine

1983-02-22

1985-09-10

Feifer, Melvin B.

Office supplies; artists and teachers materials

Teaching material

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

D18 7

Patent

active

D02805308

REFERENCES:
patent: D232943 (1974-09-01), Maeda
patent: D258740 (1981-03-01), Matsumoto
Hong Kong Toys, 1982, p. 382, bottom, Item 610, Music Quiz Calculator.
Retailing Home Furnishings, Jun. 1, 1981, Sect. A, p. 9, bottom left, Item 670, Musical Clock/Calculator.

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