FR644705A - Perfectionnements aux dispositifs pour la reproduction électrique des sons dans lesgramophones ou autres appareils semblables
- Google Patents
Perfectionnements aux dispositifs pour la reproduction électrique des sons dans lesgramophones ou autres appareils semblables
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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Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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Filing date
Publication date
Application filed by Le Materiel Telephonique Thomson CSFfiledCriticalLe Materiel Telephonique Thomson CSF
Application grantedgrantedCritical
Publication of FR644705ApublicationCriticalpatent/FR644705A/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
H04R23/02—Transducers using more than one principle simultaneously
Landscapes
Physics & Mathematics
(AREA)
Engineering & Computer Science
(AREA)
Acoustics & Sound
(AREA)
Signal Processing
(AREA)
Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups
(AREA)
Recording Measured Values
(AREA)
FR644705D1927-01-241927-11-29Perfectionnements aux dispositifs pour la reproduction électrique des sons dans lesgramophones ou autres appareils semblables
ExpiredFR644705A
(fr)