GB541768A - Communication exchange systems - Google Patents

Communication exchange systems

Info

Publication number
GB541768A
GB541768A GB10549/40A GB1054940A GB541768A GB 541768 A GB541768 A GB 541768A GB 10549/40 A GB10549/40 A GB 10549/40A GB 1054940 A GB1054940 A GB 1054940A GB 541768 A GB541768 A GB 541768A
Authority
GB
United Kingdom
Prior art keywords
finder
relay
wire
resistances
circuit
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
GB10549/40A
Other languages
English (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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB541768A publication Critical patent/GB541768A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
GB10549/40A 1939-07-24 1940-06-18 Communication exchange systems Expired GB541768A (en)

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
GB541768A true GB541768A (en) 1941-12-10

Family

ID=23097618

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10549/40A Expired GB541768A (en) 1939-07-24 1940-06-18 Communication exchange systems

Country Status (5)

Country Link
US (1) US2295032A (enrdf_load_stackoverflow)
CH (1) CH235878A (enrdf_load_stackoverflow)
FR (1) FR867450A (enrdf_load_stackoverflow)
GB (1) GB541768A (enrdf_load_stackoverflow)
NL (1) NL57724C (enrdf_load_stackoverflow)

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 (enrdf_load_stackoverflow) * 1942-06-15 1950-04-22
NL76006C (enrdf_load_stackoverflow) * 1946-06-20
NL138284B (enrdf_load_stackoverflow) * 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 (enrdf_load_stackoverflow) * 1951-03-16

Also Published As

Publication number Publication date
CH235878A (de) 1944-12-31
US2295032A (en) 1942-09-08
NL57724C (enrdf_load_stackoverflow)
FR867450A (fr) 1941-10-27

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