FR729482A - Improvements to automatic or semi-automatic telephone systems - Google Patents

Improvements to automatic or semi-automatic telephone systems

Info

Publication number
FR729482A
FR729482A FR729482DA FR729482A FR 729482 A FR729482 A FR 729482A FR 729482D A FR729482D A FR 729482DA FR 729482 A FR729482 A FR 729482A
Authority
FR
France
Prior art keywords
automatic
semi
telephone systems
automatic telephone
systems
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.)
Thales SA
Original Assignee
Le Materiel Telephonique Thomson CSF
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 Le Materiel Telephonique Thomson CSF filed Critical Le Materiel Telephonique Thomson CSF
Application granted granted Critical
Publication of FR729482A publication Critical patent/FR729482A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q1/00Details of selecting apparatus or arrangements
    • H04Q1/18Electrical details
    • H04Q1/20Testing circuits or apparatus; Circuits or apparatus for detecting, indicating, or signalling faults or troubles
    • H04Q1/22Automatic arrangements
    • H04Q1/26Automatic arrangements for signalling trouble in unoccupied sub-exchanges

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
FR729482D 1931-03-16 1931-03-16 Improvements to automatic or semi-automatic telephone systems Expired FR729482A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR729482T 1931-03-16

Publications (1)

Publication Number Publication Date
FR729482A true FR729482A (en) 1932-07-25

Family

ID=9112474

Family Applications (1)

Application Number Title Priority Date Filing Date
FR729482D Expired FR729482A (en) 1931-03-16 1931-03-16 Improvements to automatic or semi-automatic telephone systems

Country Status (1)

Country Link
FR (1) FR729482A (en)

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