FR405608A - Transmetteurs téléphoniques - Google Patents

Transmetteurs téléphoniques

Info

Publication number
FR405608A
FR405608A FR405608A FR405608DA FR405608A FR 405608 A FR405608 A FR 405608A FR 405608 A FR405608 A FR 405608A FR 405608D A FR405608D A FR 405608DA FR 405608 A FR405608 A FR 405608A
Authority
FR
France
Prior art keywords
telephone transmitters
transmitters
telephone
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
FR405608A
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 FR405608A publication Critical patent/FR405608A/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)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Telephone Set Structure (AREA)
FR405608A 1909-07-26 1909-07-31 Transmetteurs téléphoniques Expired FR405608A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB190917368T 1909-07-26

Publications (1)

Publication Number Publication Date
FR405608A true FR405608A (fr) 1910-01-08

Family

ID=32557213

Family Applications (1)

Application Number Title Priority Date Filing Date
FR405608A Expired FR405608A (fr) 1909-07-26 1909-07-31 Transmetteurs téléphoniques

Country Status (2)

Country Link
FR (1) FR405608A (fr)
GB (1) GB190917368A (fr)

Also Published As

Publication number Publication date
GB190917368A (en) 1910-04-14

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