Educational electronic book

Details Educational electronic book Educational electronic book

1993-06-15

1995-01-24

Gandy, James M.

Office supplies; artists and teachers materials

Teaching material

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

D19 26

Patent

active

D03547698

REFERENCES:
patent: D185068 (1959-05-01), Clive
patent: D319649 (1991-09-01), Silvennoinen
patent: D333161 (1993-02-01), Hartnett
patent: D337610 (1993-07-01), Mixon
patent: 3592098 (1971-07-01), Zadig
patent: 3947978 (1976-04-01), Clark et al.
patent: 4809246 (1989-02-01), Jeng
patent: 4990092 (1991-02-01), Cummings
patent: 5167508 (1992-12-01), McTaggart
patent: 5190317 (1993-03-01), Zoland

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