GB727618A - Improvements in or relating to telephone exchange systems - Google Patents

Improvements in or relating to telephone exchange systems

Info

Publication number
GB727618A
GB727618A GB3181/53A GB318153A GB727618A GB 727618 A GB727618 A GB 727618A GB 3181/53 A GB3181/53 A GB 3181/53A GB 318153 A GB318153 A GB 318153A GB 727618 A GB727618 A GB 727618A
Authority
GB
United Kingdom
Prior art keywords
junction
operator
key
relay
selecting
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
GB3181/53A
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 GB727618A publication Critical patent/GB727618A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/60—Semi-automatic systems, i.e. in which the numerical selection of the outgoing line is under the control of an operator

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Exchange Systems With Centralized Control (AREA)
GB3181/53A 1952-02-04 1953-02-04 Improvements in or relating to telephone exchange systems Expired GB727618A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE727618X 1952-02-04

Publications (1)

Publication Number Publication Date
GB727618A true GB727618A (en) 1955-04-06

Family

ID=20316167

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3181/53A Expired GB727618A (en) 1952-02-04 1953-02-04 Improvements in or relating to telephone exchange systems

Country Status (3)

Country Link
BE (1) BE517356A (nl)
DE (1) DE953266C (nl)
GB (1) GB727618A (nl)

Also Published As

Publication number Publication date
BE517356A (nl)
DE953266C (de) 1956-11-29

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