Office supplies; artists and teachers materials – Teaching material – Sensory feedback – e.g. – audio-visual teaching machine
Patent
1988-10-13
1991-10-29
Burke, Wallace R.
Office supplies; artists and teachers materials
Teaching material
Sensory feedback, e.g., audio-visual teaching machine
D18 7
Patent
active
D03212084
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patent: D269442 (1983-06-01), Nakajima et al.
patent: D269857 (1983-07-01), Goodin et al.
patent: D274314 (1984-06-01), Goodin et al.
patent: D278341 (1985-04-01), Scheid
patent: D294573 (1988-03-01), Ohzu
"Language Translators", article in Popular Science, 2/1980.
Bergstresser, Sr. Arthur R.
Craig Edward
Bergstresser, Sr. Arthur R.
Burke Wallace R.
Craig Edward
Schmidt Pamela
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