GB538725A - Improvements in or relating to selector switches such as are used in automatic telephone systems - Google Patents

Improvements in or relating to selector switches such as are used in automatic telephone systems

Info

Publication number
GB538725A
GB538725A GB274540A GB274540A GB538725A GB 538725 A GB538725 A GB 538725A GB 274540 A GB274540 A GB 274540A GB 274540 A GB274540 A GB 274540A GB 538725 A GB538725 A GB 538725A
Authority
GB
United Kingdom
Prior art keywords
relating
telephone systems
selector switches
automatic telephone
metal
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
GB274540A
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
Priority to GB274540A priority Critical patent/GB538725A/en
Publication of GB538725A publication Critical patent/GB538725A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H63/00—Details of electrically-operated selector switches
    • H01H63/02—Contacts; Wipers; Connections thereto
    • H01H63/06—Contact banks

Landscapes

  • Elimination Of Static Electricity (AREA)
  • Push-Button Switches (AREA)
  • Ropes Or Cables (AREA)

Abstract

538,725. Automatic exchange switches. STANDARD TELEPHONES & CABLES, Ltd. and MILLS, E. Feb. 13, 1940, No. 2745. [Class 40 (iv)] The conductive spacers which separate the levels of a terminal bank and which are connected together to act as a screen are made of insulating material coated with metal on one or both surfaces. The material may be a synthetic resin, ebonite, vulcanized fibre or phenol fibre, and the metal is applied by hot-spraying after the surface has been prepared by abrasion or otherwise.
GB274540A 1940-02-13 1940-02-13 Improvements in or relating to selector switches such as are used in automatic telephone systems Expired GB538725A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB274540A GB538725A (en) 1940-02-13 1940-02-13 Improvements in or relating to selector switches such as are used in automatic telephone systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB274540A GB538725A (en) 1940-02-13 1940-02-13 Improvements in or relating to selector switches such as are used in automatic telephone systems

Publications (1)

Publication Number Publication Date
GB538725A true GB538725A (en) 1941-08-14

Family

ID=9745082

Family Applications (1)

Application Number Title Priority Date Filing Date
GB274540A Expired GB538725A (en) 1940-02-13 1940-02-13 Improvements in or relating to selector switches such as are used in automatic telephone systems

Country Status (1)

Country Link
GB (1) GB538725A (en)

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