Portable electronic dictionary

Details Portable electronic dictionary Portable electronic dictionary

1990-03-07

1991-06-18

Burke, Wallace R.

Office supplies; artists and teachers materials

Teaching material

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

D18 7, D14100

Patent

active

D03176266

REFERENCES:
patent: D242471 (1976-11-01), Kitai
patent: D262140 (1981-12-01), Yamagami et al.
patent: D300539 (1989-04-01), Wong
patent: D303980 (1989-10-01), Yubisui et al.
patent: 3892958 (1975-07-01), Tung
patent: 4090247 (1978-05-01), Martin

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