DE310319C - - Google Patents

Info

Publication number
DE310319C
DE310319C DENDAT310319D DE310319DA DE310319C DE 310319 C DE310319 C DE 310319C DE NDAT310319 D DENDAT310319 D DE NDAT310319D DE 310319D A DE310319D A DE 310319DA DE 310319 C DE310319 C DE 310319C
Authority
DE
Germany
Prior art keywords
membrane
electrodes
grains
coal
microphone
Prior art date
Legal status (The legal status 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 status listed.)
Active
Application number
DENDAT310319D
Other languages
German (de)
English (en)
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 DE310319C publication Critical patent/DE310319C/de
Active legal-status Critical Current

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41B—MACHINES OR ACCESSORIES FOR MAKING, SETTING, OR DISTRIBUTING TYPE; TYPE; PHOTOGRAPHIC OR PHOTOELECTRIC COMPOSING DEVICES
    • B41B11/00—Details of, or accessories for, machines for mechanical composition using matrices for individual characters which are selected and assembled for type casting or moulding
    • B41B11/18—Devices or arrangements for assembling matrices and space bands

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Mechanical Operated Clutches (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Preliminary Treatment Of Fibers (AREA)
DENDAT310319D 1913-04-12 Active DE310319C (cs)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US191405174XA 1913-04-12 1913-04-12

Publications (1)

Publication Number Publication Date
DE310319C true DE310319C (cs)

Family

ID=32597441

Family Applications (1)

Application Number Title Priority Date Filing Date
DENDAT310319D Active DE310319C (cs) 1913-04-12

Country Status (2)

Country Link
DE (1) DE310319C (cs)
GB (1) GB191405174A (cs)

Also Published As

Publication number Publication date
GB191405174A (en) 1915-02-25

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