FR337271A - Transmetteur téléphonique - Google Patents

Transmetteur téléphonique

Info

Publication number
FR337271A
FR337271A FR337271DA FR337271A FR 337271 A FR337271 A FR 337271A FR 337271D A FR337271D A FR 337271DA FR 337271 A FR337271 A FR 337271A
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
Philip Green Randall
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 FR337271A publication Critical patent/FR337271A/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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H04R21/023—Microphones with more than one granular chamber

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR337271D 1903-12-03 1903-12-03 Transmetteur téléphonique Expired FR337271A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR337271T 1903-12-03

Publications (1)

Publication Number Publication Date
FR337271A true FR337271A (fr) 1904-04-02

Family

ID=1386629

Family Applications (1)

Application Number Title Priority Date Filing Date
FR337271D Expired FR337271A (fr) 1903-12-03 1903-12-03 Transmetteur téléphonique

Country Status (1)

Country Link
FR (1) FR337271A (fr)

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