GB542011A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB542011A
GB542011A GB10568/40A GB1056840A GB542011A GB 542011 A GB542011 A GB 542011A GB 10568/40 A GB10568/40 A GB 10568/40A GB 1056840 A GB1056840 A GB 1056840A GB 542011 A GB542011 A GB 542011A
Authority
GB
United Kingdom
Prior art keywords
relay
earth
relating
line
telephone systems
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
GB10568/40A
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 and Electric Co Ltd
Original Assignee
Automatic Telephone and Electric 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 and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Priority to GB10568/40A priority Critical patent/GB542011A/en
Priority to US390512A priority patent/US2299514A/en
Publication of GB542011A publication Critical patent/GB542011A/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)

Abstract

542,011. Automatic exchange systems. AUTOMATIC TELEPHONE & ELECTRIC CO., Ltd., and TAYLOR, R. June 19, 1940, No. 10568. [Class 40 (iv)] In an arrangement for causing a subscriber's line switch of the no-normal type to take a step upon seizure regardless of the condition of the outlet on which it stands, the magnet USM operates first in a local circuit and by opening its interrupter springs connects up an auxiliary switching relay BD which locks and establishes the usual connection to the test wiper US3. After the release of line relay R, relay BD is held in series with cut-off relay K by earth fed back over US3. An existing connection may be broken down by the application of earth from a toll final selector to the incoming test wire, thus short-circuiting BD while holding K operated.
GB10568/40A 1940-06-19 1940-06-19 Improvements in or relating to telephone systems Expired GB542011A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB10568/40A GB542011A (en) 1940-06-19 1940-06-19 Improvements in or relating to telephone systems
US390512A US2299514A (en) 1940-06-19 1941-04-26 Telephone system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB10568/40A GB542011A (en) 1940-06-19 1940-06-19 Improvements in or relating to telephone systems

Publications (1)

Publication Number Publication Date
GB542011A true GB542011A (en) 1941-12-22

Family

ID=9970243

Family Applications (1)

Application Number Title Priority Date Filing Date
GB10568/40A Expired GB542011A (en) 1940-06-19 1940-06-19 Improvements in or relating to telephone systems

Country Status (2)

Country Link
US (1) US2299514A (en)
GB (1) GB542011A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2544944A (en) * 1947-06-03 1951-03-13 Automatic Elect Lab Restricted service automatic telephone system
US2733298A (en) * 1950-11-29 1956-01-31 Automatic telephone systems
BE534740A (en) * 1951-04-06

Also Published As

Publication number Publication date
US2299514A (en) 1942-10-20

Similar Documents

Publication Publication Date Title
GB542011A (en) Improvements in or relating to telephone systems
US2277191A (en) Combined line and cutoff relay for telephone systems
US2292371A (en) Repeater circuit
US2278752A (en) Busy signal for automatic telephone systems
US2344653A (en) Telephone line circuit
US2105898A (en) Telephone exchange system
US2060585A (en) Telephone signal circuit
US2668194A (en) Finder-allotter circuit for telephone systems
GB583373A (en) Improvements in automatic switches for use in telephone or like systems
US2322864A (en) Trouble cutoff system
US2295200A (en) Trunk hunting circuit
GB222847A (en) Improvements in impulse repeaters, particularly for telephone systems
US2082097A (en) Telephone system
US1669031A (en) Rotary line switch
US1383805A (en) Party-line metering system for telephone-exchanges
US1655602A (en) gardner
US2033283A (en) Signaling system
US2238469A (en) Signaling system
US1823679A (en) Call charging telephone exchange system
GB602388A (en) Improvements in electrical impulsing circuits
US2103441A (en) Measured service telephone system
US1514215A (en) Measured-service telephone system
US2104975A (en) Telephone system
US1852747A (en) Trunk circuit for telephone exchange systems
US1744013A (en) Telephone system