GB449436A - Improvements in or relating to telephone exchange systems - Google Patents

Improvements in or relating to telephone exchange systems

Info

Publication number
GB449436A
GB449436A GB31678/35A GB3167835A GB449436A GB 449436 A GB449436 A GB 449436A GB 31678/35 A GB31678/35 A GB 31678/35A GB 3167835 A GB3167835 A GB 3167835A GB 449436 A GB449436 A GB 449436A
Authority
GB
United Kingdom
Prior art keywords
relay
relating
telephone exchange
telephone
exchange systems
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
GB31678/35A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB449436A publication Critical patent/GB449436A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q5/00—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange
    • H04Q5/02—Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange with direct connection for all subscribers, i.e. party-line systems
    • H04Q5/08—Signalling by continuous ac

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)

Abstract

449,436. Light - - current relays. STANDARD TELEPHONES & CABLES, Ltd., 63, Aldwych, London..-(Assignees of Vereinigte Telephon - und Telegraphenfabriks Akt.-Ges. Czeija, Nissl, Co. ; 75, Dresdnerstrasse, Vienna) Nov. 15, 1935, No. 31678. Convention date, Dec. 4, 1934. Drawings to Specification. [Class 38 (v)] [See also Group XXXIX] A telephone relay has, in addition to its ordinary contact springs, one or more additional springs tuned to a particular frequency or frequencies adapted to be superimposed on its normal operating circuit. The relay is described for use in selective calling of telephone subscribers on a party line or group system.
GB31678/35A 1934-12-04 1935-11-15 Improvements in or relating to telephone exchange systems Expired GB449436A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT449436X 1934-12-04

Publications (1)

Publication Number Publication Date
GB449436A true GB449436A (en) 1936-06-26

Family

ID=3674378

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31678/35A Expired GB449436A (en) 1934-12-04 1935-11-15 Improvements in or relating to telephone exchange systems

Country Status (1)

Country Link
GB (1) GB449436A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3070666A (en) * 1960-07-22 1962-12-25 Bell Telephone Labor Inc Distributed line concentrator system
US4188511A (en) * 1978-01-27 1980-02-12 Tone Commander Systems, Inc. Multi-link telephone intercom system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3070666A (en) * 1960-07-22 1962-12-25 Bell Telephone Labor Inc Distributed line concentrator system
US4188511A (en) * 1978-01-27 1980-02-12 Tone Commander Systems, Inc. Multi-link telephone intercom system

Similar Documents

Publication Publication Date Title
GB1402160A (en) Telephone systems
GB449436A (en) Improvements in or relating to telephone exchange systems
GB522457A (en) Improvements in or relating to systems of simultaneous telephony on a number of lines
GB498520A (en) Improvements in and relating to telephone installations
US2102735A (en) Carrier telegraph system
US1869458A (en) Communication system
GB336946A (en) Improvements in circuit arrangements for conference telephones
GB501705A (en) Telegraph exchange system
GB394585A (en) Improvements in or relating to telephone systems
GB207219A (en) Automatic telephone system and switching apparatus therefor
GB460159A (en) Circuit arrangement for interconnecting teleprinters
GB516519A (en) Improvements in or relating to telephone systems
GB371535A (en) Improvements in or relating to telephone systems
GB495213A (en) Improvements in or relating to telephone systems
GB296424A (en) Circuit arrangement for double duty selectors in telephone installations
GB326571A (en) Improvements in or relating to telephone systems
GB207483A (en) Automatic telephone system and switching apparatus therefor
GB1134908A (en) Selective ringing in a telephone system
GB707435A (en) Improvements in or relating to telephone systems
GB191325720A (en) Improvements in Telephone Systems.
GB230472A (en) Improvements in and relating to automatic telephone systems
GB356217A (en) Improvements in or relating to telephone systems
GB927456A (en) Improvements in and relating to radio signalling systems
ES404430A1 (en) Telegraph switch system. (Machine-translation by Google Translate, not legally binding)
GB403571A (en) Improvements in carrier current signalling systems