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TELEGRAPHON GmbH
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TELEGRAPHON GmbH
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Application filed by TELEGRAPHON GmbHfiledCriticalTELEGRAPHON GmbH
Application grantedgrantedCritical
Publication of FR527719ApublicationCriticalpatent/FR527719A/fr
H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
H04R11/00—Transducers of moving-armature or moving-core type
H04R11/08—Gramophone pick-ups using a stylus; Recorders using a stylus
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Physics & Mathematics
(AREA)
Electromagnetism
(AREA)
Engineering & Computer Science
(AREA)
Acoustics & Sound
(AREA)
Signal Processing
(AREA)
Electromagnets
(AREA)
FR527719A1920-01-111920-11-27Récepteur enregistreur téléphonique pour phonographes à dicter, téléphonographes et appareils analogues
ExpiredFR527719A
(fr)