Magic sound book

Details Magic sound book Magic sound book

1994-06-20

1995-05-02

Gandy, James M.

Office supplies; artists and teachers materials

Teaching material

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

D19 26

Patent

active

D03579379

REFERENCES:
patent: 2544568 (1951-03-01), Shepherd
patent: 4616851 (1986-10-01), Mann
patent: 5022682 (1991-06-01), Desmond
patent: 5248164 (1993-09-01), Lepretre

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