FR655645A - Improvements to automatic telephone systems - Google Patents

Improvements to automatic telephone systems

Info

Publication number
FR655645A
FR655645A FR655645DA FR655645A FR 655645 A FR655645 A FR 655645A FR 655645D A FR655645D A FR 655645DA FR 655645 A FR655645 A FR 655645A
Authority
FR
France
Prior art keywords
telephone systems
automatic telephone
automatic
systems
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 FR655645A publication Critical patent/FR655645A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/32—Signalling arrangements; Manipulation of signalling currents using trains of dc pulses

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
FR655645D 1927-07-30 1928-06-12 Improvements to automatic telephone systems Expired FR655645A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE655645X 1927-07-30

Publications (1)

Publication Number Publication Date
FR655645A true FR655645A (en) 1929-04-22

Family

ID=20314167

Family Applications (1)

Application Number Title Priority Date Filing Date
FR655645D Expired FR655645A (en) 1927-07-30 1928-06-12 Improvements to automatic telephone systems

Country Status (1)

Country Link
FR (1) FR655645A (en)

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