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G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
G10K7/00—Sirens
G10K7/005—Ultrasonic sirens
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FR842545A1960-10-281960-10-28Procédé et dispositif pour la production de vibrations dans des milieux gazeux ou liquides
ExpiredFR1275558A
(fr)