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Electrical Improvements Ltd
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Electrical Improvements Ltd
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Application filed by Electrical Improvements LtdfiledCriticalElectrical Improvements Ltd
Application grantedgrantedCritical
Publication of FR657136ApublicationCriticalpatent/FR657136A/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
G10K13/00—Cones, diaphragms, or the like, for emitting or receiving sound in general
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FR657136D1927-07-201928-07-07Perfectionnements aux appareils reproducteurs de sons
ExpiredFR657136A
(fr)