Telephone dual earpiece

Details Telephone dual earpiece Telephone dual earpiece

1992-07-06

1994-05-24

Burke, Wallace R.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Element or attachment

Patent

active

D03472280

REFERENCES:
patent: D287127 (1986-12-01), Yuen
patent: D299457 (1989-01-01), Behnk
patent: D305027 (1989-12-01), Catey et al.
patent: D312256 (1990-11-01), Blomberg
patent: D326090 (1992-05-01), Kikuchi et al.
patent: 2620891 (1952-12-01), Heap
patent: 3301955 (1967-01-01), Clements, Jr.
patent: 4175217 (1979-11-01), Williams
patent: 4905276 (1990-02-01), Catey et al.
patent: 5034979 (1991-07-01), Erickson

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