Learning screen

Details Learning screen Learning screen

1977-05-19

1980-06-10

Feifer, Melvin B.

Office supplies; artists and teachers materials

Teaching material

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

D1907

Patent

active

D02553686

REFERENCES:
patent: D238170 (1975-12-01), Schmidt
patent: 2927381 (1960-03-01), Renner
patent: 3157955 (1964-11-01), Pfeiffer

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