GB598224A - Improvements in or relating to telecommunication systems - Google Patents

Improvements in or relating to telecommunication systems

Info

Publication number
GB598224A
GB598224A GB19742/46A GB1974246A GB598224A GB 598224 A GB598224 A GB 598224A GB 19742/46 A GB19742/46 A GB 19742/46A GB 1974246 A GB1974246 A GB 1974246A GB 598224 A GB598224 A GB 598224A
Authority
GB
United Kingdom
Prior art keywords
relating
telecommunication systems
automatic
automatic exchange
subscribers
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
GB19742/46A
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 GB598224A publication Critical patent/GB598224A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/38—Signalling arrangements; Manipulation of signalling currents using combinations of direct currents of different amplitudes or polarities over line conductors or combination of line conductors

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Exchange Systems With Centralized Control (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

598,224. Automatic exchange systems. STANDARD TELEPHONES & CABLES, Ltd. March 30, 1945, No. 19742/46. Convention date, May 1, 1944. Divided out of 598,188. Drawings to Specification. [Class 40 (iv)] Describes an automatic or semi-automatic exchange system identical with that described in Specification 598,188, but the claims are directed to the manner of operation of the register-controller by the subscribers' key-sets.
GB19742/46A 1944-05-01 1945-03-30 Improvements in or relating to telecommunication systems Expired GB598224A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US598224XA 1944-05-01 1944-05-01

Publications (1)

Publication Number Publication Date
GB598224A true GB598224A (en) 1948-02-12

Family

ID=22025491

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19742/46A Expired GB598224A (en) 1944-05-01 1945-03-30 Improvements in or relating to telecommunication systems

Country Status (1)

Country Link
GB (1) GB598224A (en)

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