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Application filed by Marconi's Wireless Telegraph Co LtdfiledCriticalMarconi's Wireless Telegraph Co Ltd
Publication of BE355238ApublicationCriticalpatent/BE355238A/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
G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
G10K11/08—Non-electric sound-amplifying devices, e.g. non-electric megaphones
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Physics & Mathematics
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Engineering & Computer Science
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Acoustics & Sound
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Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups
(AREA)
BE355238A1927-10-251928-10-25Perfectionnements aux dispositifs de reproduction et d'enregistrement électromagnetiques pour gramophones
BE355238A
(fr)
Perfectionnements aux dispositifs électromagnétiques pour la traduction des vibrations, particuliè rement applicables à l'enregistrement et à la reproduction des sons