DE271487C - - Google Patents

Info

Publication number
DE271487C
DE271487C DENDAT271487D DE271487DA DE271487C DE 271487 C DE271487 C DE 271487C DE NDAT271487 D DENDAT271487 D DE NDAT271487D DE 271487D A DE271487D A DE 271487DA DE 271487 C DE271487 C DE 271487C
Authority
DE
Germany
Prior art keywords
record
membrane
opening
carbon
powder
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
DENDAT271487D
Other languages
German (de)
English (en)
Publication of DE271487C publication Critical patent/DE271487C/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; 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)
DENDAT271487D Active DE271487C (Direct)

Publications (1)

Publication Number Publication Date
DE271487C true DE271487C (Direct)

Family

ID=528132

Family Applications (1)

Application Number Title Priority Date Filing Date
DENDAT271487D Active DE271487C (Direct)

Country Status (1)

Country Link
DE (1) DE271487C (Direct)

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