Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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COLUMBIA GRAPHOPHONE CO Ltd
Original Assignee
COLUMBIA GRAPHOPHONE CO Ltd
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Filing date
Publication date
Application filed by COLUMBIA GRAPHOPHONE CO LtdfiledCriticalCOLUMBIA GRAPHOPHONE CO Ltd
Application grantedgrantedCritical
Publication of FR720145ApublicationCriticalpatent/FR720145A/fr
H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
H04R9/12—Gramophone pick-ups using a stylus; Recorders using a stylus
Landscapes
Physics & Mathematics
(AREA)
Engineering & Computer Science
(AREA)
Acoustics & Sound
(AREA)
Signal Processing
(AREA)
Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers
(AREA)
Time Recorders, Dirve Recorders, Access Control
(AREA)
FR720145D1930-07-191931-07-18Perfectionnements aux appareils enregistreurs et reproducteurs de sons à bobine mobile et appareils similaires
ExpiredFR720145A
(fr)