FR765736A - Device facilitating the observation of the duration of telephone calls - Google Patents

Device facilitating the observation of the duration of telephone calls

Info

Publication number
FR765736A
FR765736A FR765736DA FR765736A FR 765736 A FR765736 A FR 765736A FR 765736D A FR765736D A FR 765736DA FR 765736 A FR765736 A FR 765736A
Authority
FR
France
Prior art keywords
observation
duration
telephone calls
device facilitating
facilitating
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.)
FABRICATION ET LA VENTE DE TOU
Original Assignee
FABRICATION ET LA VENTE DE TOU
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 FABRICATION ET LA VENTE DE TOU filed Critical FABRICATION ET LA VENTE DE TOU
Application granted granted Critical
Publication of FR765736A publication Critical patent/FR765736A/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)
FR765736D 1933-12-18 1933-12-18 Device facilitating the observation of the duration of telephone calls Expired FR765736A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR765736T 1933-12-18

Publications (1)

Publication Number Publication Date
FR765736A true FR765736A (en) 1934-06-14

Family

ID=9182924

Family Applications (1)

Application Number Title Priority Date Filing Date
FR765736D Expired FR765736A (en) 1933-12-18 1933-12-18 Device facilitating the observation of the duration of telephone calls

Country Status (1)

Country Link
FR (1) FR765736A (en)

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