GB253574A - Improvements in automatic or semi-automatic telephone systems - Google Patents

Improvements in automatic or semi-automatic telephone systems

Info

Publication number
GB253574A
GB253574A GB674025A GB674025A GB253574A GB 253574 A GB253574 A GB 253574A GB 674025 A GB674025 A GB 674025A GB 674025 A GB674025 A GB 674025A GB 253574 A GB253574 A GB 253574A
Authority
GB
United Kingdom
Prior art keywords
automatic
semi
telephone systems
sets
lowry
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
GB674025A
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.)
WESTERN ELECTRIC CO Ltd
AT&T Corp
Original Assignee
WESTERN ELECTRIC CO Ltd
Western Electric Co Inc
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 WESTERN ELECTRIC CO Ltd, Western Electric Co Inc filed Critical WESTERN ELECTRIC CO Ltd
Priority to GB674025A priority Critical patent/GB253574A/en
Publication of GB253574A publication Critical patent/GB253574A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/26—Devices for calling a subscriber
    • H04M1/27—Devices whereby a plurality of signals may be stored simultaneously
    • H04M1/272—Devices whereby a plurality of signals may be stored simultaneously with provision for storing only one subscriber number at a time, e.g. by keyboard or dial

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)

Abstract

253,574. Standard Telephones & Cables, Ltd., (formerly Western Electric Co., Ltd.), and Lowry, L. P. March 12, 1925. Drawings to Specification. Semi-automatic exchange systems.-An operator's position is provided with duplicate sets of apparatus, the change-over from one set to the other being effected either manually by the operation of a key or automatically on the development of a fault in the set in use. If desired, more than two sets may be provided. The invention is described with reference to a keyboard equipment which forms part of the complete system described in Specification 254,183. Specifications 253,575 and 255,130 also are referred to.
GB674025A 1925-03-12 1925-03-12 Improvements in automatic or semi-automatic telephone systems Expired GB253574A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB674025A GB253574A (en) 1925-03-12 1925-03-12 Improvements in automatic or semi-automatic telephone systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB674025A GB253574A (en) 1925-03-12 1925-03-12 Improvements in automatic or semi-automatic telephone systems

Publications (1)

Publication Number Publication Date
GB253574A true GB253574A (en) 1926-06-14

Family

ID=9819906

Family Applications (1)

Application Number Title Priority Date Filing Date
GB674025A Expired GB253574A (en) 1925-03-12 1925-03-12 Improvements in automatic or semi-automatic telephone systems

Country Status (1)

Country Link
GB (1) GB253574A (en)

Similar Documents

Publication Publication Date Title
GB744358A (en) Improvements in or relating to telephone subscriber's metering equipment
GB549948A (en) Carrier frequency telephone system
GB253574A (en) Improvements in automatic or semi-automatic telephone systems
GB295449A (en) Improvements in telephone systems
US2107817A (en) Inter-office communication system
US2410866A (en) Telephone system
GB255130A (en) Improvements in automatic or semi-automatic telephone systems
US2027142A (en) Telephone exchange system
US2290335A (en) Repeater system
US2577759A (en) Trunk telephone office without three cords
GB283971A (en) Improvements in electric circuits for central telephone offices
US1820116A (en) Testing system
US2030971A (en) Operator's telephone circuit
DE715495C (en) Laying device for mobile telecommunication lines or cables
US1915383A (en) Telephone system
US1860455A (en) Lineman's test set
US2345959A (en) Telephone system
US1466856A (en) Telephone system
US1429241A (en) Telephone system
US1352568A (en) Telephone system
US1665231A (en) Telephone system
US1890480A (en) Telephone system
ES261154A1 (en) Conference call circuit
US2246576A (en) Machine ringing system
US1463600A (en) Telephone system