Office supplies; artists and teachers materials – Teaching material – Sensory feedback – e.g. – audio-visual teaching machine
Patent
1983-01-27
1986-03-11
Feifer, Melvin B.
Office supplies; artists and teachers materials
Teaching material
Sensory feedback, e.g., audio-visual teaching machine
Patent
active
D02829355
REFERENCES:
patent: D194517 (1963-02-01), Banks
patent: 3662077 (1972-05-01), Kersten
patent: 4323349 (1982-04-01), Maltzman et al.
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