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.)
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filedfiledCritical
Application grantedgrantedCritical
Publication of FR544671ApublicationCriticalpatent/FR544671A/fr
H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
Landscapes
Physics & Mathematics
(AREA)
Electromagnetism
(AREA)
Engineering & Computer Science
(AREA)
Acoustics & Sound
(AREA)
Signal Processing
(AREA)
FR544671D1921-12-171921-12-17Système de réglage pour tout type de récepteur, téléphonie, télégraphie sans fil, haut-parleur, etc.
ExpiredFR544671A
(fr)