FR742731A - - Google Patents

Info

Publication number
FR742731A
FR742731A FR742731DA FR742731A FR 742731 A FR742731 A FR 742731A FR 742731D A FR742731D A FR 742731DA FR 742731 A FR742731 A FR 742731A
Authority
FR
France
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)
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.)
Publication date
Application granted granted Critical
Publication of FR742731A publication Critical patent/FR742731A/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)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Amplitude Modulation (AREA)
FR742731D 1936-04-17 Expired FR742731A (el)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1107536A GB471270A (en) 1936-04-17 1936-04-17 Improvements in or relating to granular microphones

Publications (1)

Publication Number Publication Date
FR742731A true FR742731A (el) 1933-03-14

Family

ID=9979554

Family Applications (1)

Application Number Title Priority Date Filing Date
FR742731D Expired FR742731A (el) 1936-04-17

Country Status (3)

Country Link
BE (1) BE390588A (el)
FR (1) FR742731A (el)
GB (2) GB383348A (el)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1061825B (de) * 1954-02-26 1959-07-23 Hans Widmaier Kohlegriessmikrophon-Sprechkapsel

Also Published As

Publication number Publication date
BE390588A (el)
GB383348A (en) 1932-11-17
GB471270A (en) 1937-09-01

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