Dual-tone multi-frequency microphone

Details Dual-tone multi-frequency microphone Dual-tone multi-frequency microphone

1995-05-25

1996-12-17

Morris, Sandra L.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Element or attachment

Patent

active

D03765997

REFERENCES:
patent: D244779 (1977-06-01), Kobayashi
patent: D249041 (1978-08-01), Culbertson
patent: D253767 (1979-12-01), Peterson
patent: D281419 (1985-11-01), Nagele
patent: D352718 (1994-11-01), Lindeman

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