FR341133A - Variable magnetic field telephone - Google Patents

Variable magnetic field telephone

Info

Publication number
FR341133A
FR341133A FR341133DA FR341133A FR 341133 A FR341133 A FR 341133A FR 341133D A FR341133D A FR 341133DA FR 341133 A FR341133 A FR 341133A
Authority
FR
France
Prior art keywords
magnetic field
variable magnetic
field telephone
telephone
variable
Prior art date
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
Other languages
French (fr)
Inventor
Alexandre Giraudet
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.)
ALEXANDRE GIRAUDET
Original Assignee
ALEXANDRE GIRAUDET
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 ALEXANDRE GIRAUDET filed Critical ALEXANDRE GIRAUDET
Application granted granted Critical
Publication of FR341133A publication Critical patent/FR341133A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
FR341133D 1904-01-29 1904-01-29 Variable magnetic field telephone Expired FR341133A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR341133T 1904-01-29

Publications (1)

Publication Number Publication Date
FR341133A true FR341133A (en) 1904-07-30

Family

ID=1390212

Family Applications (1)

Application Number Title Priority Date Filing Date
FR341133D Expired FR341133A (en) 1904-01-29 1904-01-29 Variable magnetic field telephone

Country Status (1)

Country Link
FR (1) FR341133A (en)

Similar Documents

Publication Publication Date Title
FR341133A (en) Variable magnetic field telephone
FR340094A (en) Circular slide rule
FR340358A (en) Sophisticated taps
FR343177A (en) Hairpin enhancements
FR350203A (en) Phone enhancements
FR344555A (en) Pre-paid telephone auto-switch device
FR7564E (en) Electromagnets for magnetic field of phones
FR351015A (en) Induction regulator
CH32739A (en) Telephone installation with prior payment
FR323518A (en) Metal coils
FR356400A (en) Repeating rifle
FR342339A (en) Money order phonograph
FR346317A (en) Music purse
FR353031A (en) Screw clamps
FR3395E (en) Metallic cord
FR341561A (en) Metallic cord
FR395507A (en) Variable self-induction coil
FR342232A (en) Exhaust bell
FR359908A (en) Paragrele with electromagnetic waves
FR340826A (en) Adding machine
FR359350A (en) Ruhmkorff coil
FR343290A (en) Crossover refinements
FR355454A (en) electrometer
CH408E (en) Cabel Canal
CH26145A (en) Slide rule