GB221175A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB221175A
GB221175A GB16416/24A GB1641624A GB221175A GB 221175 A GB221175 A GB 221175A GB 16416/24 A GB16416/24 A GB 16416/24A GB 1641624 A GB1641624 A GB 1641624A GB 221175 A GB221175 A GB 221175A
Authority
GB
United Kingdom
Prior art keywords
call
exchange
over
automatic
switch
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
GB16416/24A
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.)
Automatic Telephone Manufacturing Co Ltd
Original Assignee
Automatic Telephone Manufacturing Co Ltd
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 Automatic Telephone Manufacturing Co Ltd filed Critical Automatic Telephone Manufacturing Co Ltd
Publication of GB221175A publication Critical patent/GB221175A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker

Landscapes

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

Abstract

221,175. Automatic Telephone Manufacturing Co. Ltd., Mercer, R., and Tench, F. May 31, 1923. Drawings to Specification. Semi-automatic exchange systems.-In a system in which calls from a manual exchange are set up over automatic switches by operators at a tandem exchange by means of keyboard-controlled impulse senders accessible in common to a number of operators over selecting switches, when the full number of digits, for example seven, have been stored, a start relay which initiates the transmission of impulses is energized over the selecting switch and the 8th contact of a switch which connects up the registers in turn. If the wanted number comprises less than seven digits, a start key must be pressed. After seven sets of impulses have been transmitted, the 8th contact of the register-controlling switch is employed to send a further set to indicate in the case of a call going to a call-indicator position that the call has come from a tandem exchange. The system is identical with the second arrangement described in Specification 220.405. Specifications 175,260, 192,036, and 219,079 also are referred to.
GB16416/24A 1923-05-31 1923-05-31 Improvements in or relating to telephone systems Expired GB221175A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB14410/23A GB220405A (en) 1923-05-31 1923-05-31 Improvements in or relating to telephone systems

Publications (1)

Publication Number Publication Date
GB221175A true GB221175A (en) 1924-09-01

Family

ID=10040692

Family Applications (2)

Application Number Title Priority Date Filing Date
GB16416/24A Expired GB221175A (en) 1923-05-31 1923-05-31 Improvements in or relating to telephone systems
GB14410/23A Expired GB220405A (en) 1923-05-31 1923-05-31 Improvements in or relating to telephone systems

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB14410/23A Expired GB220405A (en) 1923-05-31 1923-05-31 Improvements in or relating to telephone systems

Country Status (2)

Country Link
US (1) US1651401A (en)
GB (2) GB221175A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2666578A (en) * 1946-12-17 1954-01-19 Bell Telephone Labor Inc Switching control system

Also Published As

Publication number Publication date
US1651401A (en) 1927-12-06
GB220405A (en) 1924-08-21

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