DE299313C - - Google Patents

Info

Publication number
DE299313C
DE299313C DENDAT299313D DE299313DA DE299313C DE 299313 C DE299313 C DE 299313C DE NDAT299313 D DENDAT299313 D DE NDAT299313D DE 299313D A DE299313D A DE 299313DA DE 299313 C DE299313 C DE 299313C
Authority
DE
Germany
Prior art keywords
grains
coal
membrane
reserve
chamber
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
DENDAT299313D
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 DE299313C publication Critical patent/DE299313C/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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
DENDAT299313D 1914-11-14 Active DE299313C (cg-RX-API-DMAC10.html)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US480775XA 1914-11-14 1914-11-14

Publications (1)

Publication Number Publication Date
DE299313C true DE299313C (cg-RX-API-DMAC10.html)

Family

ID=6091213

Family Applications (1)

Application Number Title Priority Date Filing Date
DENDAT299313D Active DE299313C (cg-RX-API-DMAC10.html) 1914-11-14

Country Status (2)

Country Link
DE (1) DE299313C (cg-RX-API-DMAC10.html)
FR (1) FR480775A (cg-RX-API-DMAC10.html)

Also Published As

Publication number Publication date
FR480775A (fr) 1916-09-21

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