Electronic educational game

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

Patent

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Details

D21 13, D14106

Patent

active

D03478564

REFERENCES:
patent: D252926 (1979-09-01), Thompson et al.
patent: D262718 (1982-01-01), Dweck
patent: D311523 (1990-10-01), Cheung et al.
patent: D327498 (1992-06-01), Watson et al.

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