FR934086A - Perfectionnements apportés aux procédés et appareils pour produire des ondes de compression dans un fluide tel que de l'air ou un gaz
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Perfectionnements apportés aux procédés et appareils pour produire des ondes de compression dans un fluide tel que de l'air ou un gaz
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Ultrasonic Corp
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Ultrasonic Corp
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Publication of FR934086ApublicationCriticalpatent/FR934086A/fr
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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Physics & Mathematics
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Engineering & Computer Science
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Acoustics & Sound
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Multimedia
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FR934086D1945-10-251946-10-01Perfectionnements apportés aux procédés et appareils pour produire des ondes de compression dans un fluide tel que de l'air ou un gaz
ExpiredFR934086A
(fr)