Interactive audiovisual board

Details Interactive audiovisual board Interactive audiovisual board

1994-01-10

1995-08-22

Word, A. Hugo

Office supplies; artists and teachers materials

Teaching material

Sensory feedback, e.g., audio-visual teaching machine

D21 14

Patent

active

D03615979

REFERENCES:
patent: D256028 (1980-07-01), Lawrence et al.
patent: D279489 (1985-07-01), Mak
patent: D321174 (1991-10-01), Tsuchiya
patent: D354947 (1995-01-01), Peart

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