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FR679277A - Improvements to telephone installations - Google Patents

Improvements to telephone installations

Info

Publication number
FR679277A
FR679277A FR679277DA FR679277A FR 679277 A FR679277 A FR 679277A FR 679277D A FR679277D A FR 679277DA FR 679277 A FR679277 A FR 679277A
Authority
FR
France
Prior art keywords
telephone installations
installations
telephone
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
Other languages
French (fr)
Inventor
Gotthilf Ansgarius Betulander
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 filed Critical
Application granted granted Critical
Publication of FR679277A publication Critical patent/FR679277A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/001—Current supply source at the exchanger providing current to substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR679277D 1928-08-10 1929-07-25 Improvements to telephone installations Expired FR679277A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE679277X 1928-08-10

Publications (1)

Publication Number Publication Date
FR679277A true FR679277A (en) 1930-04-10

Family

ID=20314854

Family Applications (1)

Application Number Title Priority Date Filing Date
FR679277D Expired FR679277A (en) 1928-08-10 1929-07-25 Improvements to telephone installations

Country Status (1)

Country Link
FR (1) FR679277A (en)

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