GB655573A - Improvements in or relating to automatic telephone systems - Google Patents

Improvements in or relating to automatic telephone systems

Info

Publication number
GB655573A
GB655573A GB34029/47A GB3402947A GB655573A GB 655573 A GB655573 A GB 655573A GB 34029/47 A GB34029/47 A GB 34029/47A GB 3402947 A GB3402947 A GB 3402947A GB 655573 A GB655573 A GB 655573A
Authority
GB
United Kingdom
Prior art keywords
line
relays
relay
operates
energizes
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
GB34029/47A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB655573A publication Critical patent/GB655573A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0004—Selecting arrangements using crossbar selectors in the switching stages

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Exchange Systems With Centralized Control (AREA)
GB34029/47A 1945-04-04 1947-12-23 Improvements in or relating to automatic telephone systems Expired GB655573A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE655573X 1945-04-04

Publications (1)

Publication Number Publication Date
GB655573A true GB655573A (en) 1951-07-25

Family

ID=20314162

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34029/47A Expired GB655573A (en) 1945-04-04 1947-12-23 Improvements in or relating to automatic telephone systems

Country Status (4)

Country Link
US (1) US2620401A (en:Method)
FR (1) FR959047A (en:Method)
GB (1) GB655573A (en:Method)
NL (1) NL78645C (en:Method)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE510536A (en:Method) * 1951-04-10
US2853694A (en) * 1952-06-11 1958-09-23 Bell Telephone Labor Inc Electron discharge tube circuit

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1337715A (en) * 1920-04-20 Telephone system
GB295421A (en) * 1927-05-10 1928-08-10 Standard Telephones Cables Ltd Improvements in telephone systems
US1870621A (en) * 1927-11-21 1932-08-09 John E Gardner Automatic telephone system
US1886216A (en) * 1929-06-21 1932-11-01 Ericsson Telefon Ab L M Electrical signaling and operating circuit
US1964526A (en) * 1933-03-31 1934-06-26 Western Electric Co Testing system and apparatus therefor
GB478652A (en) * 1936-07-21 1938-01-21 Automatic Electric Co Ltd Improvements in or relating to automatic switch controlling circuits for automatic telephone or like signalling systems
US2164335A (en) * 1938-04-13 1939-07-04 Bell Telephone Labor Inc Telephone system
US2317191A (en) * 1941-01-24 1943-04-20 Bell Telephone Labor Inc Telephone system
US2308637A (en) * 1941-12-20 1943-01-19 Bell Telephone Labor Inc Telephone system
US2332912A (en) * 1942-05-01 1943-10-26 Bell Telephone Labor Inc Telephone system
US2387018A (en) * 1942-08-05 1945-10-16 Bell Lab Inc Communication system
US2379715A (en) * 1942-10-09 1945-07-03 Bell Telephone Labor Inc Communication system

Also Published As

Publication number Publication date
NL78645C (en:Method) 1955-08-15
US2620401A (en) 1952-12-02
FR959047A (en:Method) 1950-03-23

Similar Documents

Publication Publication Date Title
GB798749A (en) Improvements in or relating to automatic telephone exchanges providing automatic transfer service
GB843225A (en) Improvements in or relating to electrical systems for determining the condition of electrical devices
GB655573A (en) Improvements in or relating to automatic telephone systems
US2901544A (en) Four-party station identification circuit
US2760005A (en) Telephone call originator
GB710161A (en) Improvements in or relating to automatic telephone systems
US2547804A (en) Telephone line identification system
US2806088A (en) Communication system
US2967212A (en) Identifying testing or discriminating device
US2306087A (en) Key pulsing register circuit
US2038303A (en) Signaling system
US2504274A (en) System for automatic telephone exchanges with crossbar switches and private branch exchange trunk lines
US2635147A (en) Telephone selector switch utilizing odd-even relay
US2236499A (en) Telephone system
US1916760A (en) Telephone exchange system
US2303356A (en) Selecting system
GB617932A (en) Improvements in telephone switching systems
US2333179A (en) Communication system
US2041084A (en) Telephone system
US2644932A (en) Pulse amplitude responsive selective system
US3697704A (en) Circuits for private automatic telephone exchange systems
US3761635A (en) Trunk circuit identification
US1540053A (en) Impulse-receiving circuit
US2126875A (en) Selection controlling apparatus for telephone systems
US2486111A (en) Balancing of ring cutoff circuit for long and short lines