GB500898A - Improvements in electric selective switching systems - Google Patents

Improvements in electric selective switching systems

Info

Publication number
GB500898A
GB500898A GB3281137A GB3281137A GB500898A GB 500898 A GB500898 A GB 500898A GB 3281137 A GB3281137 A GB 3281137A GB 3281137 A GB3281137 A GB 3281137A GB 500898 A GB500898 A GB 500898A
Authority
GB
United Kingdom
Prior art keywords
switching systems
selective switching
relay
electric selective
test relay
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
GB3281137A
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
Priority to GB3281137A priority Critical patent/GB500898A/en
Publication of GB500898A publication Critical patent/GB500898A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Relay Circuits (AREA)

Abstract

500,898. Automatic exchange systems. SIEMENS BROS. & CO., Ltd., and PATTERSON, W. G. Nov. 27, 1937, No. 32811. Drawings to Specification. [Class 40 (iv)] In a hunting switch in which the test relay is of low resistance while the marking potential is fed through a high resistance, the relay upon operation closes a holding circuit over a second winding to guard against the shunting effect of a similar test relay in another switch. A bidirectional finder is described which is identical with that described in Specification 500,891. Specification 405,436, [Group XXXVII], also is referred to.
GB3281137A 1937-11-27 1937-11-27 Improvements in electric selective switching systems Expired GB500898A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3281137A GB500898A (en) 1937-11-27 1937-11-27 Improvements in electric selective switching systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3281137A GB500898A (en) 1937-11-27 1937-11-27 Improvements in electric selective switching systems

Publications (1)

Publication Number Publication Date
GB500898A true GB500898A (en) 1939-02-17

Family

ID=10344346

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3281137A Expired GB500898A (en) 1937-11-27 1937-11-27 Improvements in electric selective switching systems

Country Status (1)

Country Link
GB (1) GB500898A (en)

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