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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Compagnie Francaise Thomson Houston SA
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Compagnie Francaise Thomson Houston SA
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Publication date
Application filed by Compagnie Francaise Thomson Houston SAfiledCriticalCompagnie Francaise Thomson Houston SA
Application grantedgrantedCritical
Publication of FR669349ApublicationCriticalpatent/FR669349A/fr
H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
H04R11/00—Transducers of moving-armature or moving-core type
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Physics & Mathematics
(AREA)
Electromagnetism
(AREA)
Engineering & Computer Science
(AREA)
Acoustics & Sound
(AREA)
Signal Processing
(AREA)
Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers
(AREA)
FR669349D1928-02-151929-02-08Perfectionnements aux instruments électro-magnétiques pour transformer des courants oscillants en sons et inversement
ExpiredFR669349A
(fr)