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Henry Heinrich & Co
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Henry Heinrich & Co
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Publication date
Application filed by Henry Heinrich & CofiledCriticalHenry Heinrich & Co
Application grantedgrantedCritical
Publication of FR872894ApublicationCriticalpatent/FR872894A/fr
H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
H04R1/00—Details of transducers, loudspeakers or microphones
H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
H04R1/225—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only for telephonic receivers
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Acoustics & Sound
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FR872894D1940-06-071941-06-05Appareil électroacoustique pour l'enregistrement ou pour la reproduction des vibrations sonores
ExpiredFR872894A
(fr)
Armature pour appareil électro-magnétique, spécialement pour appareil électro-acoustique, destiné par exemple à l'enregistrement ou à la reproduction de pistes sonores