GB636920A - Improvements in or relating to automatic telephone systems - Google Patents

Improvements in or relating to automatic telephone systems

Info

Publication number
GB636920A
GB636920A GB21768/47A GB2176847A GB636920A GB 636920 A GB636920 A GB 636920A GB 21768/47 A GB21768/47 A GB 21768/47A GB 2176847 A GB2176847 A GB 2176847A GB 636920 A GB636920 A GB 636920A
Authority
GB
United Kingdom
Prior art keywords
line
relay
frame
relays
choice
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
GB21768/47A
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Publication of GB636920A publication Critical patent/GB636920A/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)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Exchange Systems With Centralized Control (AREA)
  • Interface Circuits In Exchanges (AREA)
GB21768/47A 1938-11-16 1947-08-07 Improvements in or relating to automatic telephone systems Expired GB636920A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US240698A US2201573A (en) 1938-11-16 1938-11-16 Telephone system

Publications (1)

Publication Number Publication Date
GB636920A true GB636920A (en) 1950-05-10

Family

ID=22907570

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21768/47A Expired GB636920A (en) 1938-11-16 1947-08-07 Improvements in or relating to automatic telephone systems

Country Status (5)

Country Link
US (1) US2201573A (enrdf_load_stackoverflow)
CH (1) CH277164A (enrdf_load_stackoverflow)
FR (1) FR951376A (enrdf_load_stackoverflow)
GB (1) GB636920A (enrdf_load_stackoverflow)
NL (1) NL68476C (enrdf_load_stackoverflow)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2504274A (en) * 1945-04-16 1950-04-18 Ericsson Telefon Ab L M System for automatic telephone exchanges with crossbar switches and private branch exchange trunk lines
US2574903A (en) * 1948-04-08 1951-11-13 Kellogg Switchboard & Supply Translator for shifted lines and parties
US2674657A (en) * 1949-04-04 1954-04-06 Itt Primary-secondary-spread crossbar telephone system
BE522048A (enrdf_load_stackoverflow) * 1949-04-04
US2680781A (en) * 1949-11-08 1954-06-08 Bell Telephone Labor Inc Translating arrangement
US2710893A (en) * 1951-03-27 1955-06-14 Itt Automatic telephone system and translator therefor
FR2958209B1 (fr) 2010-04-01 2012-07-20 Oberthur Technologies Document de valeur, a couches de protection respectivement mate et brillante

Also Published As

Publication number Publication date
CH277164A (fr) 1951-08-15
US2201573A (en) 1940-05-21
NL68476C (enrdf_load_stackoverflow)
FR951376A (fr) 1949-10-24

Similar Documents

Publication Publication Date Title
US3178516A (en) Call forwarding arrangement
GB550235A (en) Improvements in telephone systems
GB636920A (en) Improvements in or relating to automatic telephone systems
US3308242A (en) Switching system minimizing traffic between switch frames
US2929881A (en) Terminal-per-station telephone partyline switching system
US2409586A (en) Automatic telephone system
US2299212A (en) Telephone system
US2084105A (en) Telephone control system
GB617932A (en) Improvements in telephone switching systems
GB700341A (en) Automatic toll-ticketing system
US2882343A (en) Automatic telephone systems
GB916637A (en) Improvements relating to automatic telecommunication and like switching systems
US2839609A (en) Terminal-per-station party-line telephone system
US1542977A (en) Telephone-exchange system
US3310630A (en) Circuit arrangement for automatic telephone systems with different kinds of telephone communications
US2337642A (en) Automatic toll ticketing system
GB989336A (en) Improvements relating to automatic telecommunication switching systems
US2899503A (en) Dial telephone system arranged for machine
US1559244A (en) Telephone-exchange system
US2718557A (en) Auxiliary-service telephone system
US2573569A (en) Frame and trunk selection
US3205313A (en) Circuit arrangement in an automatic telephone system for rendering the subscriber's number independent of his location in the selector multiple
US1965435A (en) Telephone system
US3183307A (en) Multicustomer private branch exchange
GB786821A (en) Circuit arrangements for markers in exchange systems, particularly telephone systems