FR377472A - Transmetteur téléphonique - Google Patents

Transmetteur téléphonique

Info

Publication number
FR377472A
FR377472A FR377472DA FR377472A FR 377472 A FR377472 A FR 377472A FR 377472D A FR377472D A FR 377472DA FR 377472 A FR377472 A FR 377472A
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
English (en)
Inventor
Ralph Cowan Browne
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR377472A publication Critical patent/FR377472A/fr
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)
FR377472D 1907-05-02 1907-05-02 Transmetteur téléphonique Expired FR377472A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR377472T 1907-05-02

Publications (1)

Publication Number Publication Date
FR377472A true FR377472A (fr) 1907-09-07

Family

ID=1423899

Family Applications (1)

Application Number Title Priority Date Filing Date
FR377472D Expired FR377472A (fr) 1907-05-02 1907-05-02 Transmetteur téléphonique

Country Status (1)

Country Link
FR (1) FR377472A (fr)

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