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H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
H04R7/00—Diaphragms for electromechanical transducers; Cones
H04R7/16—Mounting or tensioning of diaphragms or cones
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FR379888D1907-07-131907-07-13Perfectionnements au diaphragme enregistreur et reproducteur pour phonographes à disques ou à cylindres
ExpiredFR379888A
(fr)