FR493579A - Perfectionnement aux transmetteurs téléphoniques - Google Patents

Perfectionnement aux transmetteurs téléphoniques

Info

Publication number
FR493579A
FR493579A FR493579A FR493579DA FR493579A FR 493579 A FR493579 A FR 493579A FR 493579 A FR493579 A FR 493579A FR 493579D A FR493579D A FR 493579DA FR 493579 A FR493579 A FR 493579A
Authority
FR
France
Prior art keywords
advanced training
telephone transmitters
transmitters
telephone
training
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.)
Expired
Application number
FR493579A
Other languages
English (en)
Inventor
Johan Skinderviken
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR493579A publication Critical patent/FR493579A/fr
Expired 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
    • H04R21/02—Microphones
    • H04R21/021—Microphones with granular resistance material

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
FR493579A 1917-11-07 1918-11-19 Perfectionnement aux transmetteurs téléphoniques Expired FR493579A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US120734XA 1917-11-07 1917-11-07

Publications (1)

Publication Number Publication Date
FR493579A true FR493579A (fr) 1919-08-13

Family

ID=32391549

Family Applications (1)

Application Number Title Priority Date Filing Date
FR493579A Expired FR493579A (fr) 1917-11-07 1918-11-19 Perfectionnement aux transmetteurs téléphoniques

Country Status (2)

Country Link
FR (1) FR493579A (fr)
GB (1) GB120734A (fr)

Also Published As

Publication number Publication date
GB120734A (en) 1919-11-12

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