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Publication of FR42562EpublicationCriticalpatent/FR42562E/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
G10K7/02—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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Acoustics & Sound
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FR42562D1932-04-151932-04-15Méthode de réception d'échos et appareil de sondage aérien ou sousmarin pour sonapplication
ExpiredFR42562E
(fr)