DE223610C - - Google Patents

Info

Publication number
DE223610C
DE223610C DENDAT223610D DE223610DA DE223610C DE 223610 C DE223610 C DE 223610C DE NDAT223610 D DENDAT223610 D DE NDAT223610D DE 223610D A DE223610D A DE 223610DA DE 223610 C DE223610 C DE 223610C
Authority
DE
Germany
Prior art keywords
microphone
movable
contact
spring
contacts
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
DENDAT223610D
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 DE223610C publication Critical patent/DE223610C/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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R21/00—Variable-resistance transducers
    • H04R21/04—Gramophone pick-ups using a stylus; Recorders using a stylus

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
DENDAT223610D 1909-03-30 Active DE223610C (fa)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB190907605T 1909-03-30

Publications (1)

Publication Number Publication Date
DE223610C true DE223610C (fa)

Family

ID=32443206

Family Applications (1)

Application Number Title Priority Date Filing Date
DENDAT223610D Active DE223610C (fa) 1909-03-30

Country Status (3)

Country Link
DE (1) DE223610C (fa)
FR (1) FR405273A (fa)
GB (1) GB190907605A (fa)

Also Published As

Publication number Publication date
FR405273A (fr) 1909-12-24
GB190907605A (en) 1909-09-30

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