FR722379A - Improvements to automatic and semi-automatic telephone systems - Google Patents

Improvements to automatic and semi-automatic telephone systems

Info

Publication number
FR722379A
FR722379A FR722379DA FR722379A FR 722379 A FR722379 A FR 722379A FR 722379D A FR722379D A FR 722379DA FR 722379 A FR722379 A FR 722379A
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 FR722379A publication Critical patent/FR722379A/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
    • H04M3/14—Signalling existence of persistent "off-hook" condition

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR722379D 1930-12-01 1930-12-01 Improvements to automatic and semi-automatic telephone systems Expired FR722379A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR722379T 1930-12-01

Publications (1)

Publication Number Publication Date
FR722379A true FR722379A (en) 1932-03-16

Family

ID=9101166

Family Applications (1)

Application Number Title Priority Date Filing Date
FR722379D Expired FR722379A (en) 1930-12-01 1930-12-01 Improvements to automatic and semi-automatic telephone systems

Country Status (1)

Country Link
FR (1) FR722379A (en)

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