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H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
H04R7/00—Diaphragms for electromechanical transducers; Cones
H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
H04R7/04—Plane diaphragms
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FR654845D1928-05-251928-05-25Procédé d'enregistrement et de reproduction phonographique et dispositifs en permettant la réalisation
ExpiredFR654845A
(fr)