CH558626A - Kohlemikrophon, insbesondere fuer telephonapparate. - Google Patents

Kohlemikrophon, insbesondere fuer telephonapparate.

Info

Publication number
CH558626A
CH558626A CH1640273A CH1640273A CH558626A CH 558626 A CH558626 A CH 558626A CH 1640273 A CH1640273 A CH 1640273A CH 1640273 A CH1640273 A CH 1640273A CH 558626 A CH558626 A CH 558626A
Authority
CH
Switzerland
Prior art keywords
charcoal
microphone
telephone apparatus
telephone
charcoal microphone
Prior art date
Application number
CH1640273A
Other languages
German (de)
English (en)
Original Assignee
Int Standard Electric Corp
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 Int Standard Electric Corp filed Critical Int Standard Electric Corp
Publication of CH558626A publication Critical patent/CH558626A/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)
  • Lubricants (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Telephone Set Structure (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
CH1640273A 1972-11-24 1973-11-20 Kohlemikrophon, insbesondere fuer telephonapparate. CH558626A (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5431472A GB1360559A (en) 1972-11-24 1972-11-24 Carbon microphone

Publications (1)

Publication Number Publication Date
CH558626A true CH558626A (de) 1975-01-31

Family

ID=10470609

Family Applications (1)

Application Number Title Priority Date Filing Date
CH1640273A CH558626A (de) 1972-11-24 1973-11-20 Kohlemikrophon, insbesondere fuer telephonapparate.

Country Status (15)

Country Link
US (1) US3859478A (enrdf_load_stackoverflow)
JP (1) JPS4984430A (enrdf_load_stackoverflow)
AR (1) AR199010A1 (enrdf_load_stackoverflow)
AT (1) ATA982873A (enrdf_load_stackoverflow)
AU (1) AU6192973A (enrdf_load_stackoverflow)
BE (1) BE807626A (enrdf_load_stackoverflow)
BR (1) BR7308746D0 (enrdf_load_stackoverflow)
CA (1) CA995349A (enrdf_load_stackoverflow)
CH (1) CH558626A (enrdf_load_stackoverflow)
DE (1) DE2358243A1 (enrdf_load_stackoverflow)
ES (1) ES420820A1 (enrdf_load_stackoverflow)
FR (1) FR2208266B3 (enrdf_load_stackoverflow)
GB (1) GB1360559A (enrdf_load_stackoverflow)
IT (1) IT1001915B (enrdf_load_stackoverflow)
NL (1) NL7315631A (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5541570A (en) * 1994-12-09 1996-07-30 Force Imaging Technologies, Inc. Force sensing ink, method of making same and improved force sensor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US486244A (en) * 1892-11-15 Charles clamond
US919908A (en) * 1908-07-13 1909-04-27 Harold Sheen Martin Electrical-resistance device.
US1086726A (en) * 1909-03-11 1914-02-10 Johan Burchardt Opsahl Resistance unit.

Also Published As

Publication number Publication date
AR199010A1 (es) 1974-07-31
GB1360559A (en) 1974-07-17
ES420820A1 (es) 1976-04-01
IT1001915B (it) 1976-04-30
ATA982873A (de) 1976-05-15
FR2208266B3 (enrdf_load_stackoverflow) 1976-10-08
NL7315631A (enrdf_load_stackoverflow) 1974-05-28
BR7308746D0 (pt) 1974-08-22
CA995349A (en) 1976-08-17
AU6192973A (en) 1975-05-01
FR2208266A1 (enrdf_load_stackoverflow) 1974-06-21
US3859478A (en) 1975-01-07
BE807626A (nl) 1974-05-22
JPS4984430A (enrdf_load_stackoverflow) 1974-08-14
DE2358243A1 (de) 1974-05-30

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Legal Events

Date Code Title Description
PL Patent ceased