GB200781A - Improvements in or relating to automatic telephone systems - Google Patents

Improvements in or relating to automatic telephone systems

Info

Publication number
GB200781A
GB200781A GB1451623A GB1451623A GB200781A GB 200781 A GB200781 A GB 200781A GB 1451623 A GB1451623 A GB 1451623A GB 1451623 A GB1451623 A GB 1451623A GB 200781 A GB200781 A GB 200781A
Authority
GB
United Kingdom
Prior art keywords
relating
telephone systems
automatic telephone
lenaghan
jan
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
GB1451623A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB1451623A priority Critical patent/GB200781A/en
Publication of GB200781A publication Critical patent/GB200781A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/08—Indicating faults in circuits or apparatus
    • H04M3/14—Signalling existence of persistent "off-hook" condition

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

200,781. Lenaghan, T. Jan. 16, 1922. Drawings to Specification. Hot-wire relays which close circuits only after an interval comprise zinc rods which expand when heated by currents in surrounding coils.
GB1451623A 1922-01-16 1922-01-16 Improvements in or relating to automatic telephone systems Expired GB200781A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1451623A GB200781A (en) 1922-01-16 1922-01-16 Improvements in or relating to automatic telephone systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1451623A GB200781A (en) 1922-01-16 1922-01-16 Improvements in or relating to automatic telephone systems

Publications (1)

Publication Number Publication Date
GB200781A true GB200781A (en) 1923-07-16

Family

ID=10042606

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1451623A Expired GB200781A (en) 1922-01-16 1922-01-16 Improvements in or relating to automatic telephone systems

Country Status (1)

Country Link
GB (1) GB200781A (en)

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