JPS5334923B2 - - Google Patents

Info

Publication number
JPS5334923B2
JPS5334923B2 JP9571973A JP9571973A JPS5334923B2 JP S5334923 B2 JPS5334923 B2 JP S5334923B2 JP 9571973 A JP9571973 A JP 9571973A JP 9571973 A JP9571973 A JP 9571973A JP S5334923 B2 JPS5334923 B2 JP S5334923B2
Authority
JP
Japan
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
JP9571973A
Other languages
Japanese (ja)
Other versions
JPS5046009A (en
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
Priority to JP9571973A priority Critical patent/JPS5334923B2/ja
Priority to DE19742417180 priority patent/DE2417180A1/en
Priority to FR7415567A priority patent/FR2246137A1/en
Publication of JPS5046009A publication Critical patent/JPS5046009A/ja
Publication of JPS5334923B2 publication Critical patent/JPS5334923B2/ja
Expired 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)
JP9571973A 1973-08-28 1973-08-28 Expired JPS5334923B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP9571973A JPS5334923B2 (en) 1973-08-28 1973-08-28
DE19742417180 DE2417180A1 (en) 1973-08-28 1974-04-09 SYSTEM FOR CALLING AN INTERCOM
FR7415567A FR2246137A1 (en) 1973-08-28 1974-05-06 Subscriber calling system - is for commercial installations line selection system PBX and the like

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
JPS5046009A JPS5046009A (en) 1975-04-24
JPS5334923B2 true JPS5334923B2 (en) 1978-09-25

Family

ID=14145275

Family Applications (1)

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

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
FR2246137B1 (en) 1977-10-21
DE2417180A1 (en) 1975-04-10

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