Talking mathematics trainer

Details Talking mathematics trainer Talking mathematics trainer

1983-03-04

1985-08-20

Feifer, Melvin B.

Office supplies; artists and teachers materials

Teaching material

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

D18 7

Patent

active

D02802171

REFERENCES:
patent: D256028 (1980-07-01), Lawrence et al.
patent: D269356 (1983-06-01), Yoshioka et al.
patent: D273594 (1984-04-01), Lovejoy
Hong Kong Toys, 1982, p. 382, top left, Item 899, Talking Computer.

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