DE243505C - - Google Patents

Info

Publication number
DE243505C
DE243505C DENDAT243505D DE243505DA DE243505C DE 243505 C DE243505 C DE 243505C DE NDAT243505 D DENDAT243505 D DE NDAT243505D DE 243505D A DE243505D A DE 243505DA DE 243505 C DE243505 C DE 243505C
Authority
DE
Germany
Prior art keywords
microphone
grains
coal
plates
membranes
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.)
Active
Application number
DENDAT243505D
Other languages
German (de)
English (en)
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 of DE243505C publication Critical patent/DE243505C/de
Active 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)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
DENDAT243505D 1910-02-09 Active DE243505C (enExample)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191003179T 1910-02-09

Publications (1)

Publication Number Publication Date
DE243505C true DE243505C (enExample)

Family

ID=32560560

Family Applications (1)

Application Number Title Priority Date Filing Date
DENDAT243505D Active DE243505C (enExample) 1910-02-09

Country Status (3)

Country Link
DE (1) DE243505C (enExample)
FR (1) FR425338A (enExample)
GB (1) GB191003179A (enExample)

Also Published As

Publication number Publication date
GB191003179A (en) 1910-11-03
FR425338A (fr) 1911-06-08

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