Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Telephone equipment
Patent
1989-11-30
1992-03-03
Burke, Wallace R.
Recording, communication, or information retrieval equipment
Video or audio transmission, recording or playback equipment
Telephone equipment
D18 6, D14100
Patent
active
D03243788
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IBM Technical Disclosure Bulletin, Aug. 1967, vol. 10, No. 3 Wallet Terminal Keyboard with Acoustic Coupler.
Burke Wallace R.
National Transaction Network
Nunn Freda S.
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