Office supplies; artists and teachers materials – Teaching material – Sensory feedback – e.g. – audio-visual teaching machine
Patent
1988-04-15
1991-06-04
Burke, Wallace R.
Office supplies; artists and teachers materials
Teaching material
Sensory feedback, e.g., audio-visual teaching machine
Patent
active
D03173259
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patent: D308510 (1990-06-01), Cheung
patent: 3729836 (1973-05-01), Mayeda
patent: 3771255 (1973-11-01), Carabet et al.
patent: 4001947 (1977-01-01), Kilby
patent: 4639225 (1987-01-01), Washizuka
Burke Wallace R.
Schmidt Pamela J.
Video Technology Industries, Inc.
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