GB556929A - Improvements in or relating to automatic or semi-automatic telephone systems - Google Patents

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

Info

Publication number
GB556929A
GB556929A GB1487143A GB1487143A GB556929A GB 556929 A GB556929 A GB 556929A GB 1487143 A GB1487143 A GB 1487143A GB 1487143 A GB1487143 A GB 1487143A GB 556929 A GB556929 A GB 556929A
Authority
GB
United Kingdom
Prior art keywords
automatic
relating
semi
telephone systems
impulses
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
GB1487143A
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 Telephone and Electric Co Ltd
Original Assignee
Automatic Telephone and Electric Co 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 Automatic Telephone and Electric Co Ltd filed Critical Automatic Telephone and Electric Co Ltd
Priority to GB1487143A priority Critical patent/GB556929A/en
Publication of GB556929A publication Critical patent/GB556929A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H67/00—Electrically-operated selector switches
    • H01H67/02—Multi-position wiper switches
    • H01H67/04—Multi-position wiper switches having wipers movable only in one direction for purpose of selection
    • H01H67/12—Linear-motion switches

Landscapes

  • Interface Circuits In Exchanges (AREA)
  • Telephonic Communication Services (AREA)

Abstract

556,929. Automatic exchange systems. AUTOMATIC TELEPHONE & ELECTRIC CO., Ltd., and BAKER, G. T. April 20, 1942, No. 14871/43. Divided out of 556,922. Drawings to Specification. [Class 40 (iv)] The description is the same as a part of that in Specification 556,922. The claims relate to the transmission of impulses of alternating current between exchanges, such impulses being short compared with the duration of the initiating impulses and unaffected by such duration. Specifications 545,634, 549,047, 551,187, 556,919, 556,920 and 556,921 also are referred to.
GB1487143A 1942-04-20 1942-04-20 Improvements in or relating to automatic or semi-automatic telephone systems Expired GB556929A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1487143A GB556929A (en) 1942-04-20 1942-04-20 Improvements in or relating to automatic or semi-automatic telephone systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1487143A GB556929A (en) 1942-04-20 1942-04-20 Improvements in or relating to automatic or semi-automatic telephone systems

Publications (1)

Publication Number Publication Date
GB556929A true GB556929A (en) 1943-10-27

Family

ID=10048981

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1487143A Expired GB556929A (en) 1942-04-20 1942-04-20 Improvements in or relating to automatic or semi-automatic telephone systems

Country Status (1)

Country Link
GB (1) GB556929A (en)

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