1982-12-17
1985-01-15
Rubinson, Gene Z.
179100L, H04M 908
Patent
active
044939507
ABSTRACT:
A line powered loudspeaker telephone is provided with a lightweight headset and microphone as well as a loudspeaker and second microphone. A first switch is employed to go from the loudspeaker to the headphone and their respective microphones while a second switch is used as a listen-talk switch, preventing acoustical feedback.
REFERENCES:
patent: 3772472 (1973-11-01), Blomberg
patent: 4115659 (1978-09-01), Spanel et al.
Dwyer James L.
Rubinson Gene Z.
Slick Robert G.
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