FR540737A - Improvements to automatic telephone systems - Google Patents

Improvements to automatic telephone systems

Info

Publication number
FR540737A
FR540737A FR540737DA FR540737A FR 540737 A FR540737 A FR 540737A FR 540737D A FR540737D A FR 540737DA FR 540737 A FR540737 A FR 540737A
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)
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.)
Compagnie Francaise Thomson Houston SA
Original Assignee
Compagnie Francaise Thomson Houston SA
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 Compagnie Francaise Thomson Houston SA filed Critical Compagnie Francaise Thomson Houston SA
Application granted granted Critical
Publication of FR540737A publication Critical patent/FR540737A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/08—Indicating faults in circuits or apparatus
    • H04M3/12—Marking faulty circuits "busy"; Enabling equipment to disengage itself from faulty circuits ; Using redundant circuits; Response of a circuit, apparatus or system to an error

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
FR540737D 1919-12-03 1920-12-03 Improvements to automatic telephone systems Expired FR540737A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US342239A US1514240A (en) 1919-12-03 1919-12-03 Automatic telephone system

Publications (1)

Publication Number Publication Date
FR540737A true FR540737A (en) 1922-07-17

Family

ID=23340958

Family Applications (1)

Application Number Title Priority Date Filing Date
FR540737D Expired FR540737A (en) 1919-12-03 1920-12-03 Improvements to automatic telephone systems

Country Status (4)

Country Link
US (1) US1514240A (en)
DE (1) DE354791C (en)
FR (1) FR540737A (en)
GB (1) GB154613A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE847926C (en) * 1949-02-12 1952-08-28 Siemens Ag Circuit arrangement for telecommunications systems, in particular telephone systems

Also Published As

Publication number Publication date
DE354791C (en) 1922-06-15
US1514240A (en) 1924-11-04
GB154613A (en) 1922-02-09

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