FR1069308A - Operator telephone set for delayed start position and four-wire PABX tandem - Google Patents

Operator telephone set for delayed start position and four-wire PABX tandem

Info

Publication number
FR1069308A
FR1069308A FR1069308DA FR1069308A FR 1069308 A FR1069308 A FR 1069308A FR 1069308D A FR1069308D A FR 1069308DA FR 1069308 A FR1069308 A FR 1069308A
Authority
FR
France
Prior art keywords
pabx
tandem
wire
start position
telephone set
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
Rene Sueur
Pierre Finet
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 FR1069308A publication Critical patent/FR1069308A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/56—Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
FR1069308D 1952-12-30 1952-12-30 Operator telephone set for delayed start position and four-wire PABX tandem Expired FR1069308A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1069308T 1952-12-30

Publications (1)

Publication Number Publication Date
FR1069308A true FR1069308A (en) 1954-07-06

Family

ID=9604183

Family Applications (1)

Application Number Title Priority Date Filing Date
FR1069308D Expired FR1069308A (en) 1952-12-30 1952-12-30 Operator telephone set for delayed start position and four-wire PABX tandem

Country Status (1)

Country Link
FR (1) FR1069308A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1089419B (en) * 1957-02-27 1960-09-22 Siemens Ag Circuit arrangement for querying a four-wire transmission path
DE1095886B (en) * 1959-03-20 1960-12-29 Siemens Ag Interrogation device for four-wire transmission paths
DE1113009B (en) * 1960-02-12 1961-08-24 Phil Habil Oskar Vierling Dr Device for speaking and listening to four-wire and two-wire circuits
US4103118A (en) * 1977-05-02 1978-07-25 Synanon Foundation, Inc. Autobalance hybrid circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1089419B (en) * 1957-02-27 1960-09-22 Siemens Ag Circuit arrangement for querying a four-wire transmission path
DE1095886B (en) * 1959-03-20 1960-12-29 Siemens Ag Interrogation device for four-wire transmission paths
DE1113009B (en) * 1960-02-12 1961-08-24 Phil Habil Oskar Vierling Dr Device for speaking and listening to four-wire and two-wire circuits
US4103118A (en) * 1977-05-02 1978-07-25 Synanon Foundation, Inc. Autobalance hybrid circuit

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