FR483939A - Transmetteur téléphonique - Google Patents

Transmetteur téléphonique

Info

Publication number
FR483939A
FR483939A FR483939DA FR483939A FR 483939 A FR483939 A FR 483939A FR 483939D A FR483939D A FR 483939DA FR 483939 A FR483939 A FR 483939A
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
Edward Alfred Graham
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 FR483939A publication Critical patent/FR483939A/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
    • H04R21/021—Microphones with granular resistance material

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR483939D 1915-11-17 1916-06-07 Transmetteur téléphonique Expired FR483939A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB483939X 1915-11-17

Publications (1)

Publication Number Publication Date
FR483939A true FR483939A (fr) 1917-08-21

Family

ID=1520782

Family Applications (1)

Application Number Title Priority Date Filing Date
FR483939D Expired FR483939A (fr) 1915-11-17 1916-06-07 Transmetteur téléphonique

Country Status (1)

Country Link
FR (1) FR483939A (fr)

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