Combined earphone and microphone

Details Combined earphone and microphone Combined earphone and microphone

1988-03-30

1990-10-23

Bullock, B. J.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Element or attachment

D14225, D14206

Patent

active

D03115216

REFERENCES:
patent: 1587643 (1926-06-01), Harman
patent: 2474135 (1949-06-01), White
patent: 2513746 (1950-07-01), Rohr
patent: 2858544 (1958-11-01), Roth
patent: 3862378 (1975-01-01), Norris
patent: 3993879 (1976-11-01), Larkin
patent: 4020297 (1977-04-01), Brodie
patent: 4273969 (1981-06-01), Foley et al.
patent: 4335281 (1982-01-01), Scott et al.
patent: 4453050 (1984-06-01), Enokido
patent: 4702345 (1987-10-01), Janssen et al.

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