NL4427C - - Google Patents

Info

Publication number
NL4427C
NL4427C NL4427DA NL4427C NL 4427 C NL4427 C NL 4427C NL 4427D A NL4427D A NL 4427DA NL 4427 C NL4427 C NL 4427C
Authority
NL
Netherlands
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 NL4427C publication Critical patent/NL4427C/xx

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R21/00Variable-resistance transducers
    • H04R21/02Microphones
    • H04R21/021Microphones with granular resistance material

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Exhaust Silencers (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
NL4427D 1916-06-27 NL4427C (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US106093A US1342582A (en) 1916-06-27 1916-06-27 Telephone-transmitter

Publications (1)

Publication Number Publication Date
NL4427C true NL4427C (de)

Family

ID=22309447

Family Applications (1)

Application Number Title Priority Date Filing Date
NL4427D NL4427C (de) 1916-06-27

Country Status (4)

Country Link
US (1) US1342582A (de)
DE (1) DE353757C (de)
FR (1) FR495429A (de)
NL (1) NL4427C (de)

Also Published As

Publication number Publication date
FR495429A (fr) 1919-10-08
DE353757C (de) 1922-05-26
US1342582A (en) 1920-06-08

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