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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
G10K7/02—Sirens in which the sound-producing member is rotated manually or by a motor
G10K7/04—Sirens in which the sound-producing member is rotated manually or by a motor by an electric motor
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FR1160878D1956-11-221956-11-22Perfectionnements apportés aux générateurs rotatifs de mouvements vibratoires
ExpiredFR1160878A
(fr)