Educational toy viewing device

Details Educational toy viewing device Educational toy viewing device

1986-10-15

1989-01-17

Rademaker, Charles A.

Office supplies; artists and teachers materials

Teaching material

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

D21 59

Patent

active

D02994720

REFERENCES:
patent: D220796 (1971-05-01), Matsumoto
patent: D234360 (1975-02-01), Duncan
patent: D288827 (1987-03-01), Wolff
patent: D296907 (1988-07-01), Danielsson
patent: 3417490 (1968-12-01), Chuy et al.
patent: 3562923 (1971-02-01), Chuy et al.

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