GB790609A - Improvements in and relating to manual telephone exchange systems - Google Patents

Improvements in and relating to manual telephone exchange systems

Info

Publication number
GB790609A
GB790609A GB3539156A GB3539156A GB790609A GB 790609 A GB790609 A GB 790609A GB 3539156 A GB3539156 A GB 3539156A GB 3539156 A GB3539156 A GB 3539156A GB 790609 A GB790609 A GB 790609A
Authority
GB
United Kingdom
Prior art keywords
exchange systems
relating
telephone exchange
attendant
manual telephone
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
GB3539156A
Inventor
George Ronald Gunson
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.)
Ericsson Telephones Ltd
Original Assignee
Ericsson Telephones 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 Ericsson Telephones Ltd filed Critical Ericsson Telephones Ltd
Priority to GB3539156A priority Critical patent/GB790609A/en
Publication of GB790609A publication Critical patent/GB790609A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

790,609. Manual exchange systems. ERICS. SON TELEPHONES, Ltd. Nov. 20,1956, No. 35391/56. Class 40 (4). In a switchboard of the cordless type in which calling and called stations are connected to a common link such as W, X and battery feed V by similar actuation of keys Kl ... K3 individual to the stations, the circuit Y, Z used for supplying ringing current from a generator G provides an extra link over which the attendant may talk to a calling station when all normal links are in use, the attendant's key KO being moved downwardly for this purpose.
GB3539156A 1956-11-20 1956-11-20 Improvements in and relating to manual telephone exchange systems Expired GB790609A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3539156A GB790609A (en) 1956-11-20 1956-11-20 Improvements in and relating to manual telephone exchange systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3539156A GB790609A (en) 1956-11-20 1956-11-20 Improvements in and relating to manual telephone exchange systems

Publications (1)

Publication Number Publication Date
GB790609A true GB790609A (en) 1958-02-12

Family

ID=10377196

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3539156A Expired GB790609A (en) 1956-11-20 1956-11-20 Improvements in and relating to manual telephone exchange systems

Country Status (1)

Country Link
GB (1) GB790609A (en)

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