Electronic study guide unit

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

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Details

D14100, D14113

Patent

active

D03630854

REFERENCES:
patent: D259265 (1981-05-01), Henel et al.
patent: D328474 (1992-08-01), Chen
patent: D329062 (1992-09-01), Chin
patent: D338045 (1993-08-01), Rosen
patent: D355896 (1955-02-01), Gaultier

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