Vandal-proof communication system

Details Vandal-proof communication system Vandal-proof communication system

1982-12-22

1985-05-21

George, Keith E.

Electrical audio signal processing systems and devices

Hearing aids, electrical

Specified casing or housing

179100L, 179184, 381 88, H04M 104

Patent

active

045188262

ABSTRACT:
A touch switch and monitor lamp associated with an intercom station are embedded in a protective wall mounted plate with exposed ends flush with the planar surface of the plate which has openings through which sound is transmitted to or from a folded horn of a transducer having its driver unit spaced rearwardly of the plate and laterally of the openings.

REFERENCES:
patent: 2578367 (1951-12-01), Mott
patent: 3281541 (1966-10-01), Learner
patent: 3707607 (1972-12-01), Reddick
patent: 3978479 (1976-08-01), Schmitz
patent: 4045629 (1977-08-01), Anzani

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