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STARDYNE EYMAR FRERES ET CIE
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STARDYNE EYMAR FRERES ET CIE
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Application filed by STARDYNE EYMAR FRERES ET CIEfiledCriticalSTARDYNE EYMAR FRERES ET CIE
Application grantedgrantedCritical
Publication of FR667722ApublicationCriticalpatent/FR667722A/fr
H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
H04R7/00—Diaphragms for electromechanical transducers; Cones
H04R7/26—Damping by means acting directly on free portion of diaphragm or cone
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Engineering & Computer Science
(AREA)
Multimedia
(AREA)
Physics & Mathematics
(AREA)
Acoustics & Sound
(AREA)
Signal Processing
(AREA)
FR667722D1928-04-231928-04-23Perfectionnements aux appareils reproducteurs de sons, et spécialement aux diffuseurs radiotéléphoniques
ExpiredFR667722A
(fr)