Electronic book

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

Patent

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Details

D21 13, D14100

Patent

active

D03786862

REFERENCES:
patent: D321174 (1991-10-01), Tsuchiya
patent: D321175 (1991-10-01), Tsuchiya
patent: D362270 (1995-09-01), Allen
patent: 4855725 (1989-08-01), Fernandez

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