GB751564A - Improvements in or relating to electrical circuits for telephone systems - Google Patents

Improvements in or relating to electrical circuits for telephone systems

Info

Publication number
GB751564A
GB751564A GB2096054A GB2096054A GB751564A GB 751564 A GB751564 A GB 751564A GB 2096054 A GB2096054 A GB 2096054A GB 2096054 A GB2096054 A GB 2096054A GB 751564 A GB751564 A GB 751564A
Authority
GB
United Kingdom
Prior art keywords
relating
foil
electrical circuits
telephone systems
foils
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
GB2096054A
Inventor
Kenneth Henry Schmidt
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.)
RES PRODUCTS Inc
Original Assignee
RES PRODUCTS 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 RES PRODUCTS Inc filed Critical RES PRODUCTS Inc
Priority to GB2096054A priority Critical patent/GB751564A/en
Publication of GB751564A publication Critical patent/GB751564A/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
    • H04M1/68—Circuit arrangements for preventing eavesdropping

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Communication Cables (AREA)

Abstract

751,564. Cables. RESEARCH PRODUCTS, Inc. July 19, 1954, No. 20960/54. Class 36. [Also in Group XXXVII] A telephone cable having a plurality of pairs of conductors 1 is enclosed within two conductive foil wrappings 3, 5 separated by insulation 4, the foil 5 being helically applied in spaced convolutions. The ends of the foils are connected together at one end of the cable, preferably through a resistance-capacity unit 17, and at the other end are connected to an indicator circuit which operates an alarm if the foil 5 is cut or if a short-circuit is established between the two foils (see Group XXXVII).
GB2096054A 1954-07-19 1954-07-19 Improvements in or relating to electrical circuits for telephone systems Expired GB751564A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2096054A GB751564A (en) 1954-07-19 1954-07-19 Improvements in or relating to electrical circuits for telephone systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2096054A GB751564A (en) 1954-07-19 1954-07-19 Improvements in or relating to electrical circuits for telephone systems

Publications (1)

Publication Number Publication Date
GB751564A true GB751564A (en) 1956-06-27

Family

ID=10154749

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2096054A Expired GB751564A (en) 1954-07-19 1954-07-19 Improvements in or relating to electrical circuits for telephone systems

Country Status (1)

Country Link
GB (1) GB751564A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133936A (en) * 1983-01-22 1984-08-01 Pre Formed Windings Company Li Electrical apparatus
GB2166283A (en) * 1984-09-07 1986-04-30 Tenchmain Limited Transmission medium violation protection shield

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133936A (en) * 1983-01-22 1984-08-01 Pre Formed Windings Company Li Electrical apparatus
GB2166283A (en) * 1984-09-07 1986-04-30 Tenchmain Limited Transmission medium violation protection shield

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