CH273824A - Contact device with charcoal filling. - Google Patents

Contact device with charcoal filling.

Info

Publication number
CH273824A
CH273824A CH273824DA CH273824A CH 273824 A CH273824 A CH 273824A CH 273824D A CH273824D A CH 273824DA CH 273824 A CH273824 A CH 273824A
Authority
CH
Switzerland
Prior art keywords
contact device
charcoal filling
charcoal
filling
contact
Prior art date
Application number
Other languages
German (de)
Inventor
Apparatefabrik Gfeller Ag
Original Assignee
Apparatefabrik Gfeller Ag
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.)
Filing date
Publication date
Application filed by Apparatefabrik Gfeller Ag filed Critical Apparatefabrik Gfeller Ag
Publication of CH273824A publication Critical patent/CH273824A/en

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)
CH273824D 1948-10-06 1948-10-06 Contact device with charcoal filling. CH273824A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH844465X 1948-10-06

Publications (1)

Publication Number Publication Date
CH273824A true CH273824A (en) 1951-02-28

Family

ID=4541665

Family Applications (1)

Application Number Title Priority Date Filing Date
CH273824D CH273824A (en) 1948-10-06 1948-10-06 Contact device with charcoal filling.

Country Status (2)

Country Link
CH (1) CH273824A (en)
DE (1) DE844465C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1003264B (en) * 1954-07-08 1957-02-28 Annemarie Sell Geb Patrzek Carbon core microphone

Also Published As

Publication number Publication date
DE844465C (en) 1952-07-21

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