Top surface of a keypad

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Telephone equipment

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D03708993

REFERENCES:
patent: 4543631 (1985-09-01), Kurosu et al.
patent: 5197810 (1993-03-01), Zhang et al.
IBM Technical Disclosure Bulletin vol. 29 No. 12 May 1987 pp. 5383-5384.

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