Office supplies; artists and teachers materials – Teaching material – Sensory feedback – e.g. – audio-visual teaching machine
Patent
1978-05-17
1980-05-20
Feifer, Melvin B.
Office supplies; artists and teachers materials
Teaching material
Sensory feedback, e.g., audio-visual teaching machine
D16 64, D1907
Patent
active
D02550369
REFERENCES:
patent: D210915 (1968-04-01), Scott
patent: D247178 (1978-02-01), Kubnick
patent: 3939579 (1976-02-01), Andrews et al.
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