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Individual
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Individual
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Publication of FR342330ApublicationCriticalpatent/FR342330A/fr
H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
H04R23/00—Transducers other than those covered by groups H04R9/00 - H04R21/00
Landscapes
Physics & Mathematics
(AREA)
Engineering & Computer Science
(AREA)
Acoustics & Sound
(AREA)
Signal Processing
(AREA)
FR342330D1903-05-081904-04-06Reproducteur ou intensifieur de sons applicable aux phonographes, gramophones, téléphones et autres appareils similaires
ExpiredFR342330A
(fr)