Electronic sounder

Details Electronic sounder Electronic sounder

1980-06-03

1981-12-01

Pitts, Harold I.

Communications: electrical

Audible indication

Ultrasonic pest control

340384R, G08B 310

Patent

active

043039081

ABSTRACT:
An electronic sounder employs a pair of piezoelectric oscillators tuned to different frequencies to provide loud raucous sound. The sounder is especially suited for providing audible indications of an alarm condition which is sensed by an associated alarm system.

REFERENCES:
patent: 1984424 (1934-12-01), Osnos
patent: 3160767 (1964-12-01), Tindall
patent: 3259841 (1966-07-01), Proctor
patent: 3462703 (1969-08-01), Seidel
patent: 3534281 (1970-10-01), Hillhouse
patent: 3628127 (1971-12-01), Waldhavier
patent: 3922672 (1975-11-01), Birt
patent: 4183278 (1980-01-01), Rea

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