BR7308746D0 - COAL MICROPHONE - Google Patents

COAL MICROPHONE

Info

Publication number
BR7308746D0
BR7308746D0 BR8746/73A BR874673A BR7308746D0 BR 7308746 D0 BR7308746 D0 BR 7308746D0 BR 8746/73 A BR8746/73 A BR 8746/73A BR 874673 A BR874673 A BR 874673A BR 7308746 D0 BR7308746 D0 BR 7308746D0
Authority
BR
Brazil
Prior art keywords
coal
microphone
coal microphone
Prior art date
Application number
BR8746/73A
Other languages
Portuguese (pt)
Inventor
A Lawson
H Sterling
W Cragg
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 BR7308746D0 publication Critical patent/BR7308746D0/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)
  • Lubricants (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Telephone Set Structure (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
BR8746/73A 1972-11-24 1973-11-08 COAL MICROPHONE BR7308746D0 (en)

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
BR7308746D0 true BR7308746D0 (en) 1974-08-22

Family

ID=10470609

Family Applications (1)

Application Number Title Priority Date Filing Date
BR8746/73A BR7308746D0 (en) 1972-11-24 1973-11-08 COAL MICROPHONE

Country Status (15)

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

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
BE807626A (en) 1974-05-22
DE2358243A1 (en) 1974-05-30
NL7315631A (en) 1974-05-28
JPS4984430A (en) 1974-08-14
FR2208266A1 (en) 1974-06-21
CH558626A (en) 1975-01-31
US3859478A (en) 1975-01-07
FR2208266B3 (en) 1976-10-08
CA995349A (en) 1976-08-17
AU6192973A (en) 1975-05-01
AR199010A1 (en) 1974-07-31
ES420820A1 (en) 1976-04-01
ATA982873A (en) 1976-05-15
GB1360559A (en) 1974-07-17
IT1001915B (en) 1976-04-30

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