Electronic learning aid

Details Electronic learning aid Electronic learning aid

1988-04-15

1991-02-26

Burke, Wallace R.

Office supplies; artists and teachers materials

Teaching material

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

Patent

active

D03149803

REFERENCES:
patent: D234360 (1975-02-01), Duncan
patent: D234950 (1975-04-01), Anmann
patent: D282935 (1986-03-01), Shifflet
patent: 4031634 (1977-06-01), Stasting et al.

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