Teaching apparatus for correcting learning problems

Office supplies; artists and teachers materials – Teaching material – Sensory feedback – e.g. – audio-visual teaching machine

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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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