BE378889A - - Google Patents

Info

Publication number
BE378889A
BE378889A BE378889DA BE378889A BE 378889 A BE378889 A BE 378889A BE 378889D A BE378889D A BE 378889DA BE 378889 A BE378889 A BE 378889A
Authority
BE
Belgium
Application number
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 BE378889A publication Critical patent/BE378889A/xx

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)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
BE378889D 1931-07-24 BE378889A (US07655688-20100202-C00086.png)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH158672T 1931-07-24

Publications (1)

Publication Number Publication Date
BE378889A true BE378889A (US07655688-20100202-C00086.png)

Family

ID=4412633

Family Applications (1)

Application Number Title Priority Date Filing Date
BE378889D BE378889A (US07655688-20100202-C00086.png) 1931-07-24

Country Status (2)

Country Link
BE (1) BE378889A (US07655688-20100202-C00086.png)
CH (1) CH158672A (US07655688-20100202-C00086.png)

Also Published As

Publication number Publication date
CH158672A (fr) 1932-11-30

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