GB301495A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB301495A
GB301495A GB33113/28A GB3311328A GB301495A GB 301495 A GB301495 A GB 301495A GB 33113/28 A GB33113/28 A GB 33113/28A GB 3311328 A GB3311328 A GB 3311328A GB 301495 A GB301495 A GB 301495A
Authority
GB
United Kingdom
Prior art keywords
operator
over
switch
connector
relay
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
GB33113/28A
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.)
Associated Telephone and Telegraph Co
Original Assignee
Associated Telephone and Telegraph Co
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 Associated Telephone and Telegraph Co filed Critical Associated Telephone and Telegraph Co
Publication of GB301495A publication Critical patent/GB301495A/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)
  • Monitoring And Testing Of Exchanges (AREA)
GB33113/28A 1927-12-02 1928-11-12 Improvements in or relating to telephone systems Expired GB301495A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US301495XA 1927-12-02 1927-12-02

Publications (1)

Publication Number Publication Date
GB301495A true GB301495A (en) 1930-02-12

Family

ID=21852776

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33113/28A Expired GB301495A (en) 1927-12-02 1928-11-12 Improvements in or relating to telephone systems

Country Status (2)

Country Link
BE (1) BE356266A (enrdf_load_stackoverflow)
GB (1) GB301495A (enrdf_load_stackoverflow)

Also Published As

Publication number Publication date
BE356266A (enrdf_load_stackoverflow)

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