Educational toy

Details Educational toy Educational toy

1992-03-10

1994-08-16

Burke, Wallace R.

Office supplies; artists and teachers materials

Teaching material

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

D21 13, D14106

Patent

active

D03497291

REFERENCES:
patent: D299473 (1989-01-01), Murphy
patent: 3672071 (1972-06-01), Prola
patent: 4465465 (1984-08-01), Nelson
patent: 4639225 (1987-01-01), Washizuka
patent: 4681548 (1987-07-01), Lemelson

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