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GB252444A - Improvements in or relating to automatic and semi-automatic telephone systems - Google Patents

Improvements in or relating to automatic and semi-automatic telephone systems

Info

Publication number
GB252444A
GB252444A GB509025A GB509025A GB252444A GB 252444 A GB252444 A GB 252444A GB 509025 A GB509025 A GB 509025A GB 509025 A GB509025 A GB 509025A GB 252444 A GB252444 A GB 252444A
Authority
GB
United Kingdom
Prior art keywords
automatic
shall
relating
semi
line
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
GB509025A
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.)
Automatic Electric Co
Original Assignee
Automatic Electric 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 Automatic Electric Co filed Critical Automatic Electric Co
Publication of GB252444A publication Critical patent/GB252444A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

252,444. Automatic Telephone Manufacturing Co., Ltd., (Automatic Electric Co.). Feb. 24, 1925. Drawings to Specification. Automatic exchange systems; party-line systems.-Selective ringing current for party-line working is supplied from the first selector, which has associated with it two minor switches which respond to the first two digits. One of these switches determines which sets of wipers shall be used in the first and final selectors while the other determines which of five ringing frequencies shall be employed and to which leg of the wanted line it shall be applied. The system described is identical with that described in Specification 247,555.
GB509025A 1925-07-20 1925-02-24 Improvements in or relating to automatic and semi-automatic telephone systems Expired GB252444A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1852925A GB260330A (en) 1925-07-20 1925-07-20 Improvements in or relating to telephone systems

Publications (1)

Publication Number Publication Date
GB252444A true GB252444A (en) 1926-05-25

Family

ID=10113984

Family Applications (2)

Application Number Title Priority Date Filing Date
GB509025A Expired GB252444A (en) 1925-07-20 1925-02-24 Improvements in or relating to automatic and semi-automatic telephone systems
GB1852925A Expired GB260330A (en) 1925-07-20 1925-07-20 Improvements in or relating to telephone systems

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB1852925A Expired GB260330A (en) 1925-07-20 1925-07-20 Improvements in or relating to telephone systems

Country Status (2)

Country Link
FR (2) FR32235E (en)
GB (2) GB252444A (en)

Also Published As

Publication number Publication date
FR32235E (en) 1927-09-13
GB260330A (en) 1926-10-20
FR613556A (en) 1926-11-24

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