Telephone headset

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

Patent

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D14142

Patent

active

D03731278

REFERENCES:
patent: D187987 (1960-05-01), Kellogg
patent: D246781 (1977-12-01), Krolopp
patent: D263049 (1982-02-01), Cobb
patent: D296098 (1988-06-01), Nagele
patent: D299335 (1989-01-01), Wiegel
patent: D316261 (1991-04-01), Langlois
patent: D344525 (1994-02-01), Gillett et al.
patent: D355917 (1995-02-01), Grewe et al.
patent: 4754484 (1988-06-01), Larkin et al.
patent: 5003589 (1991-03-01), Chen
patent: 5054051 (1991-10-01), Hoff
patent: 5197091 (1993-03-01), Takagi et al.

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