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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
H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
H04R7/12—Non-planar diaphragms or cones
H04R7/14—Non-planar diaphragms or cones corrugated, pleated or ribbed
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FR569649D1923-08-091923-08-09Perfectionnements apportés dans l'établissement des diffuseurs acoustiques et produits nouveaux en résultant
ExpiredFR569649A
(fr)