Portable educational computer

Details Portable educational computer Portable educational computer

1987-12-10

1990-08-21

Holtje, Nelson C.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Telephone equipment

D18 1, D19 59, D21111

Patent

active

D03100715

REFERENCES:
patent: D256028 (1980-07-01), Lawrence et al.
patent: D289763 (1987-05-01), Fujii et al.
patent: 4742478 (1988-05-01), Nigro, Jr. et al.

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