GB397177A - Improvements in automatic and semi-automatic telephone plants - Google Patents

Improvements in automatic and semi-automatic telephone plants

Info

Publication number
GB397177A
GB397177A GB4995/32A GB499532A GB397177A GB 397177 A GB397177 A GB 397177A GB 4995/32 A GB4995/32 A GB 4995/32A GB 499532 A GB499532 A GB 499532A GB 397177 A GB397177 A GB 397177A
Authority
GB
United Kingdom
Prior art keywords
automatic
rack
semi
feb
telephone plants
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
GB4995/32A
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of GB397177A publication Critical patent/GB397177A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Supply And Installment Of Electrical Components (AREA)
GB4995/32A 1931-02-25 1932-02-19 Improvements in automatic and semi-automatic telephone plants Expired GB397177A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE397177X 1931-02-25

Publications (1)

Publication Number Publication Date
GB397177A true GB397177A (en) 1933-08-21

Family

ID=20309387

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4995/32A Expired GB397177A (en) 1931-02-25 1932-02-19 Improvements in automatic and semi-automatic telephone plants

Country Status (2)

Country Link
BE (1) BE386705A (enrdf_load_stackoverflow)
GB (1) GB397177A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
BE386705A (enrdf_load_stackoverflow)

Similar Documents

Publication Publication Date Title
GB516415A (en) Improvements in or relating to automatic or semi-automatic telephone systems
GB1058893A (en) Improvements in or relating to switching networks for use in telecommunications installations
GB629572A (en) Apparatus for establishing telephone connections
GB532730A (en) Improvements in or relating to automatic or semi-automatic telephone systems
GB397177A (en) Improvements in automatic and semi-automatic telephone plants
US2325877A (en) Automatic telephone system
GB413054A (en) Improvements in and relating to telephone installations
US2274535A (en) Carrier wave system
GB781563A (en) Improvements in or relating to time division multiplex communication systems
US1639135A (en) Telephone system
US2573569A (en) Frame and trunk selection
GB722102A (en) Improvements in or relating to circuit arrangement for employment in telephone installations for the selection of line groups
GB1230713A (enrdf_load_stackoverflow)
GB737778A (en) Arrangement in an automatic telecommunication exchange, for determining to which of a plurality of service classes a desired connection between two subscribers belongs
GB698177A (en) Telephone system comprising selector units built up of primary and secondary cross bar switches
GB249154A (en) Improvements in or relating to telephone systems
GB318957A (en) Improvements in and relating to automatic and semi-automatic exchange systems
GB833933A (en) Improvements in or relating to an arrangement for effecting a selective connection between a pair of lines
GB759597A (en) A telecommunication system with relay selectors
GB314042A (enrdf_load_stackoverflow)
GB562115A (en) Improvements in or relating to telephone systems employing crossbar switches
GB334248A (en) Improvements in or relating to automatic or semi-automatic telephone systems
GB393662A (en) Improvements in or relating to telegraph exchange systems
GB803510A (en) Improvements in or relating to time division multiplex communication systems
GB712013A (en) Improvements in or relating to circuit arrangements for automatic telephone installations