Resonant sounder device for producing multiple warning sounds

Details Resonant sounder device for producing multiple warning sounds Resonant sounder device for producing multiple warning sounds

1981-12-31

1984-12-11

Swann, III, Glen R.

Communications: electrical

Audible indication

Ultrasonic pest control

310317, 340679, G08B 2100

Patent

active

044881452

ABSTRACT:
The present invention produces at least two sound signals such as warning signals or actuating signals by one sounder having a resonant frequency, wherein one of the sound signals is indicated by the resonant frequency of the sounder to enable a higher intensity sound to be produced.

REFERENCES:
patent: 3872470 (1975-03-01), Hoerz et al.
patent: 4023162 (1977-05-01), Murakami
patent: 4193060 (1980-03-01), Slavin et al.
patent: 4195284 (1980-03-01), Hampshire et al.
patent: 4206448 (1980-06-01), Davis
patent: 4224613 (1980-09-01), Kaiser et al.
patent: 4272176 (1981-06-01), Maitani et al.
patent: 4396909 (1983-08-01), Suzuki

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