Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Telephone equipment
Patent
1989-03-15
1991-09-24
Burke, Wallace R.
Recording, communication, or information retrieval equipment
Video or audio transmission, recording or playback equipment
Telephone equipment
D20 15
Patent
active
D03201988
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patent: 4654990 (1987-04-01), Suters
patent: 4955153 (1990-09-01), Albrecht et al.
DEVOKE, Spring 1987, p. 78, Control Center Pushbutton Panel shown at bottom of page.
INMAC, Sept 1986, p. 38, IBM Keyboard Template shown at top of page.
Burke Wallace R.
Nunn Freda S.
Prescott Charles J.
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