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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
G10K5/00—Whistles
Landscapes
Physics & Mathematics
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Engineering & Computer Science
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Acoustics & Sound
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FR579186D1924-03-251924-03-25Perfectionnements aux sifflets-avertisseurs
ExpiredFR579186A
(fr)