FR451724A - Transmetteur téléphonique - Google Patents

Transmetteur téléphonique

Info

Publication number
FR451724A
FR451724A FR451724A FR451724DA FR451724A FR 451724 A FR451724 A FR 451724A FR 451724 A FR451724 A FR 451724A FR 451724D A FR451724D A FR 451724DA FR 451724 A FR451724 A FR 451724A
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
FR451724A
Other languages
English (en)
Inventor
Felix Gottschalk
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 FR451724A publication Critical patent/FR451724A/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)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
FR451724A 1912-11-23 1912-11-28 Transmetteur téléphonique Expired FR451724A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191226964T 1912-11-23

Publications (1)

Publication Number Publication Date
FR451724A true FR451724A (fr) 1913-04-25

Family

ID=32643664

Family Applications (1)

Application Number Title Priority Date Filing Date
FR451724A Expired FR451724A (fr) 1912-11-23 1912-11-28 Transmetteur téléphonique

Country Status (2)

Country Link
FR (1) FR451724A (fr)
GB (1) GB191226964A (fr)

Also Published As

Publication number Publication date
GB191226964A (en) 1913-09-25

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