Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Telephone equipment
Patent
1993-11-15
1995-05-16
Tung, Melanie H.
Recording, communication, or information retrieval equipment
Video or audio transmission, recording or playback equipment
Telephone equipment
Patent
active
D03583821
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patent: 4068577 (1987-07-01), Straayer et al.
patent: 5008505 (1991-04-01), Takano et al.
patent: 5040479 (1991-08-01), Thrash
patent: 5283408 (1994-02-01), Chen
IBM Technical Disclosure Bulletin "Smart Key", vol. 28, No. 5, Oct. 1985.
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