FR495429A - Transmetteur téléphonique - Google Patents

Transmetteur téléphonique

Info

Publication number
FR495429A
FR495429A FR495429A FR495429DA FR495429A FR 495429 A FR495429 A FR 495429A FR 495429 A FR495429 A FR 495429A FR 495429D A FR495429D A FR 495429DA FR 495429 A FR495429 A FR 495429A
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
FR495429A
Other languages
English (en)
Inventor
William Birrell
James Birrell
Richard Aloysius Cavenaugh
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 FR495429A publication Critical patent/FR495429A/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
    • H04R21/021—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)
  • Exhaust Silencers (AREA)
FR495429A 1916-06-27 1917-08-18 Transmetteur téléphonique Expired FR495429A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US106093A US1342582A (en) 1916-06-27 1916-06-27 Telephone-transmitter

Publications (1)

Publication Number Publication Date
FR495429A true FR495429A (fr) 1919-10-08

Family

ID=22309447

Family Applications (1)

Application Number Title Priority Date Filing Date
FR495429A Expired FR495429A (fr) 1916-06-27 1917-08-18 Transmetteur téléphonique

Country Status (4)

Country Link
US (1) US1342582A (fr)
DE (1) DE353757C (fr)
FR (1) FR495429A (fr)
NL (1) NL4427C (fr)

Also Published As

Publication number Publication date
NL4427C (fr)
DE353757C (de) 1922-05-26
US1342582A (en) 1920-06-08

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