DE107976C - - Google Patents

Info

Publication number
DE107976C
DE107976C DE1899107976D DE107976DA DE107976C DE 107976 C DE107976 C DE 107976C DE 1899107976 D DE1899107976 D DE 1899107976D DE 107976D A DE107976D A DE 107976DA DE 107976 C DE107976 C DE 107976C
Authority
DE
Germany
Prior art keywords
coal
membrane
carbon
microphone
layers
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 - Lifetime
Application number
DE1899107976D
Other languages
German (de)
English (en)
Filing date
Publication of DE107976C publication Critical patent/DE107976C/de
Application filed filed Critical
Priority to AT2122D priority Critical patent/AT2122B/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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)
  • Diaphragms For Electromechanical Transducers (AREA)
DE1899107976D 1899-02-13 1899-02-13 Expired - Lifetime DE107976C (enExample)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT2122D AT2122B (enExample) 1899-02-13 1899-11-14

Publications (1)

Publication Number Publication Date
DE107976C true DE107976C (enExample)

Family

ID=377990

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1899107976D Expired - Lifetime DE107976C (enExample) 1899-02-13 1899-02-13

Country Status (1)

Country Link
DE (1) DE107976C (enExample)

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