FR1019736A - Telephone transmitter - Google Patents

Telephone transmitter

Info

Publication number
FR1019736A
FR1019736A FR1019736DA FR1019736A FR 1019736 A FR1019736 A FR 1019736A FR 1019736D A FR1019736D A FR 1019736DA FR 1019736 A FR1019736 A FR 1019736A
Authority
FR
France
Prior art keywords
telephone transmitter
telephone
transmitter
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
Sten Daniel Vigren
Gustaf Ernfrid Gustafsson
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 filed Critical
Application granted granted Critical
Publication of FR1019736A publication Critical patent/FR1019736A/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
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H04R21/026—Microphones in which the sound is perpendicular to the current crossing the transducer material

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
FR1019736D 1950-11-19 1950-05-31 Telephone transmitter Expired FR1019736A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEV2863A DE844307C (en) 1950-11-19 1950-11-19 Coal core microphone

Publications (1)

Publication Number Publication Date
FR1019736A true FR1019736A (en) 1953-01-26

Family

ID=7570197

Family Applications (1)

Application Number Title Priority Date Filing Date
FR1019736D Expired FR1019736A (en) 1950-11-19 1950-05-31 Telephone transmitter

Country Status (3)

Country Link
CH (1) CH287033A (en)
DE (1) DE844307C (en)
FR (1) FR1019736A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1003264B (en) * 1954-07-08 1957-02-28 Annemarie Sell Geb Patrzek Carbon core microphone

Also Published As

Publication number Publication date
DE844307C (en) 1952-07-17
CH287033A (en) 1952-11-15

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