FR2246137B1 - - Google Patents

Info

Publication number
FR2246137B1
FR2246137B1 FR7415567A FR7415567A FR2246137B1 FR 2246137 B1 FR2246137 B1 FR 2246137B1 FR 7415567 A FR7415567 A FR 7415567A FR 7415567 A FR7415567 A FR 7415567A FR 2246137 B1 FR2246137 B1 FR 2246137B1
Authority
FR
France
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
FR7415567A
Other languages
French (fr)
Other versions
FR2246137A1 (en
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.)
Mitsubishi Steel Mfg Co Ltd
Mitsubishi Steel KK
Original Assignee
Mitsubishi Steel Mfg Co Ltd
Mitsubishi Steel KK
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 Mitsubishi Steel Mfg Co Ltd, Mitsubishi Steel KK filed Critical Mitsubishi Steel Mfg Co Ltd
Publication of FR2246137A1 publication Critical patent/FR2246137A1/en
Application granted granted Critical
Publication of FR2246137B1 publication Critical patent/FR2246137B1/fr
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/04—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone the ringing-current being generated at the substations

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)
FR7415567A 1973-08-28 1974-05-06 Subscriber calling system - is for commercial installations line selection system PBX and the like Granted FR2246137A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9571973A JPS5334923B2 (en) 1973-08-28 1973-08-28

Publications (2)

Publication Number Publication Date
FR2246137A1 FR2246137A1 (en) 1975-04-25
FR2246137B1 true FR2246137B1 (en) 1977-10-21

Family

ID=14145275

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7415567A Granted FR2246137A1 (en) 1973-08-28 1974-05-06 Subscriber calling system - is for commercial installations line selection system PBX and the like

Country Status (3)

Country Link
JP (1) JPS5334923B2 (en)
DE (1) DE2417180A1 (en)
FR (1) FR2246137A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1287417C (en) * 1988-03-04 1991-08-06 Guy Charles Quesnel Digital composite tone alerting

Also Published As

Publication number Publication date
JPS5046009A (en) 1975-04-24
FR2246137A1 (en) 1975-04-25
JPS5334923B2 (en) 1978-09-25
DE2417180A1 (en) 1975-04-10

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Legal Events

Date Code Title Description
ST Notification of lapse