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.)
Expired
Application number
GB1008/25A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TELEGRAFIA CESKOSLOVENSKA TOVA
Original Assignee
TELEGRAFIA CESKOSLOVENSKA TOVA
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 filed by TELEGRAFIA CESKOSLOVENSKA TOVAfiledCriticalTELEGRAFIA CESKOSLOVENSKA TOVA
Publication of GB242215ApublicationCriticalpatent/GB242215A/en
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
Landscapes
Physics & Mathematics
(AREA)
Electromagnetism
(AREA)
Engineering & Computer Science
(AREA)
Acoustics & Sound
(AREA)
Signal Processing
(AREA)
Particle Accelerators
(AREA)
Abstract
242,215. Telegrafia Ceskoslovenska tovarna na telegrafy a telephony akc. spolecnost. Oct. 29, 1924, [Convention date]. Void [Published under Sect. 91 of the Act]. Magnetic instruments. - The usual permanent magnets of a telephone are replaced by electromagnets energized by means of the usual exciting coils or by means of separate coils.
GB1008/25A1924-10-291925-01-13A telephone without permanent magnets
ExpiredGB242215A
(en)