FR740836A - Improvements made to telephone devices, in particular to those which must include laryngophonic capsules - Google Patents

Improvements made to telephone devices, in particular to those which must include laryngophonic capsules

Info

Publication number
FR740836A
FR740836A FR740836DA FR740836A FR 740836 A FR740836 A FR 740836A FR 740836D A FR740836D A FR 740836DA FR 740836 A FR740836 A FR 740836A
Authority
FR
France
Prior art keywords
laryngophonic
capsules
those
improvements made
telephone devices
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
French (fr)
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.)
Association des Ouvriers en Instruments de Precision
Original Assignee
Association des Ouvriers en Instruments de Precision
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 Association des Ouvriers en Instruments de Precision filed Critical Association des Ouvriers en Instruments de Precision
Application granted granted Critical
Publication of FR740836A publication Critical patent/FR740836A/en
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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/14—Throat mountings for microphones

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR740836D 1931-07-30 1932-07-29 Improvements made to telephone devices, in particular to those which must include laryngophonic capsules Expired FR740836A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE740836X 1931-07-30

Publications (1)

Publication Number Publication Date
FR740836A true FR740836A (en) 1933-02-01

Family

ID=3879441

Family Applications (1)

Application Number Title Priority Date Filing Date
FR740836D Expired FR740836A (en) 1931-07-30 1932-07-29 Improvements made to telephone devices, in particular to those which must include laryngophonic capsules

Country Status (2)

Country Link
BE (3) BE384854A (en)
FR (1) FR740836A (en)

Also Published As

Publication number Publication date
BE381693A (en)
BE386567A (en)
BE384854A (en)

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