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COMM APP MARCHAL SOC D EXPL
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COMM APP MARCHAL SOC D EXPL
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Application grantedgrantedCritical
Publication of FR851930ApublicationCriticalpatent/FR851930A/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
G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
G10K9/18—Details, e.g. bulbs, pumps, pistons, switches or casings
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Physics & Mathematics
(AREA)
Engineering & Computer Science
(AREA)
Acoustics & Sound
(AREA)
Multimedia
(AREA)
FR851930D1938-09-291938-09-29Perfectionnement aux appareils d'avertissement ou d'alarme
ExpiredFR851930A
(fr)