Keypad

Details Keypad Keypad

1990-12-21

1993-06-22

Burke, Wallace R.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Telephone equipment

Patent

active

D03366405

REFERENCES:
patent: D286047 (1986-10-01), Roots et al.
patent: D311913 (1990-11-01), Schaum
patent: D327881 (1992-07-01), McFarlane
IBM Technical Disclosure Bulletin. vol. 3 No. 6 Nov. 1960 key top.

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