NL57724C - - Google Patents

Info

Publication number
NL57724C
NL57724C NL57724DA NL57724C NL 57724 C NL57724 C NL 57724C NL 57724D A NL57724D A NL 57724DA NL 57724 C NL57724 C NL 57724C
Authority
NL
Netherlands
Application number
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.)
Publication of NL57724C publication Critical patent/NL57724C/xx

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q3/00Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Interface Circuits In Exchanges (AREA)
NL57724D 1939-07-24 NL57724C (en:Method)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US286220A US2295032A (en) 1939-07-24 1939-07-24 Communication exchange system

Publications (1)

Publication Number Publication Date
NL57724C true NL57724C (en:Method)

Family

ID=23097618

Family Applications (1)

Application Number Title Priority Date Filing Date
NL57724D NL57724C (en:Method) 1939-07-24

Country Status (5)

Country Link
US (1) US2295032A (en:Method)
CH (1) CH235878A (en:Method)
FR (1) FR867450A (en:Method)
GB (1) GB541768A (en:Method)
NL (1) NL57724C (en:Method)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2471415A (en) * 1940-05-22 1949-05-31 Int Standard Electric Corp Telephone calling line identification system
FR960696A (en:Method) * 1942-06-15 1950-04-22
NL78385C (en:Method) * 1946-06-20
BE486659A (en:Method) * 1948-01-08
FR993449A (fr) * 1949-06-27 1951-10-31 Materiel Telephonique Perfectionnements aux systèmes de commutation automatique
FR1034629A (fr) * 1950-11-09 1953-07-28 Materiel Telephonique Perfectionnements aux systèmes de signalisation utilisés pour caractériser les lignes d'abonnés à un réseau téléphonique
BE508995A (en:Method) * 1951-03-16

Also Published As

Publication number Publication date
US2295032A (en) 1942-09-08
GB541768A (en) 1941-12-10
CH235878A (de) 1944-12-31
FR867450A (fr) 1941-10-27

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