Portable learning unit

Details Portable learning unit Portable learning unit

1977-04-27

1979-08-14

Feifer, Melvin B.

Office supplies; artists and teachers materials

Teaching material

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

D 6157, D1401

Patent

active

D02526352

REFERENCES:
patent: D232607 (1974-09-01), Kramer et al.
patent: 3160451 (1964-12-01), Lewis
patent: 3233346 (1966-02-01), Cornberg
patent: 3728801 (1973-04-01), Beckman
patent: 4046437 (1977-09-01), Caron et al.
Sweet's Architectural Cat. File, 1969, 36b/Su, p. 4, Suttle Corp., study carrels.

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