Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Telephone equipment
Patent
1983-03-21
1985-09-24
Lucas, Susan J.
Recording, communication, or information retrieval equipment
Video or audio transmission, recording or playback equipment
Telephone equipment
Patent
active
D02807254
REFERENCES:
patent: 3541541 (1970-11-01), Engelbart
patent: 3876831 (1975-04-01), Wickham et al.
patent: 4194084 (1980-03-01), Hetzel
patent: 4255617 (1981-03-01), Carau, Sr. et al.
Computer Design, 11-1980, p. 201, GTCO Corp. Interactive Digitizer Cursor.
Lucas Susan J.
Rosen Daniel M.
Summagraphics Corporation
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