GB623263A - Improvements relating to automatic telephone systems - Google Patents

Improvements relating to automatic telephone systems

Info

Publication number
GB623263A
GB623263A GB776848A GB776848A GB623263A GB 623263 A GB623263 A GB 623263A GB 776848 A GB776848 A GB 776848A GB 776848 A GB776848 A GB 776848A GB 623263 A GB623263 A GB 623263A
Authority
GB
United Kingdom
Prior art keywords
control wire
relay
improvements relating
telephone systems
automatic telephone
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
GB776848A
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.)
Siemens Brothers and Co Ltd
Original Assignee
Siemens Brothers and 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 Siemens Brothers and Co Ltd filed Critical Siemens Brothers and Co Ltd
Publication of GB623263A publication Critical patent/GB623263A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
  • Exchange Systems With Centralized Control (AREA)
  • Structure Of Telephone Exchanges (AREA)

Abstract

623,263. Automatic exchange systems. SIEMENS BROS. & CO., Ltd., and CHRISTIAN, D. A. Feb. 1, 1946, No. 7768/48. Divided out of 623,184. Drawings to Specification. [Class 40 (iv)] In an automatic switching system, a relay is operated and held over the same control wire, the relay being operated over an earthed winding by positive battery applied to the control wire and held over a further winding connected to negative battery by subsequent earth on the control wire, means being provided to prevent the relay locking up should the control wire be disconnected. The invention is described with reference to apparatus identical with part of that described in Specification 623,184. Specification 623,177 also is referred to.
GB776848A 1946-02-01 1946-02-01 Improvements relating to automatic telephone systems Expired GB623263A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB332846A GB623184A (en) 1946-02-01 1946-02-01 Improvements relating to automatic telephone systems

Publications (1)

Publication Number Publication Date
GB623263A true GB623263A (en) 1949-05-13

Family

ID=9756242

Family Applications (3)

Application Number Title Priority Date Filing Date
GB332846A Expired GB623184A (en) 1946-02-01 1946-02-01 Improvements relating to automatic telephone systems
GB776748A Expired GB623262A (en) 1946-02-01 1946-02-01 Improvements relating to automatic telephone systems
GB776848A Expired GB623263A (en) 1946-02-01 1946-02-01 Improvements relating to automatic telephone systems

Family Applications Before (2)

Application Number Title Priority Date Filing Date
GB332846A Expired GB623184A (en) 1946-02-01 1946-02-01 Improvements relating to automatic telephone systems
GB776748A Expired GB623262A (en) 1946-02-01 1946-02-01 Improvements relating to automatic telephone systems

Country Status (1)

Country Link
GB (3) GB623184A (en)

Also Published As

Publication number Publication date
GB623184A (en) 1949-05-13
GB623262A (en) 1949-05-13

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