GB1232700A - - Google Patents

Info

Publication number
GB1232700A
GB1232700A GB1232700DA GB1232700A GB 1232700 A GB1232700 A GB 1232700A GB 1232700D A GB1232700D A GB 1232700DA GB 1232700 A GB1232700 A GB 1232700A
Authority
GB
United Kingdom
Prior art keywords
circuit
contacts
relay
open
alarm
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
Other languages
English (en)
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 filed Critical
Publication of GB1232700A publication Critical patent/GB1232700A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/06—Monitoring of the line circuits, e.g. signalling of line faults

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Alarm Systems (AREA)
  • Burglar Alarm Systems (AREA)
GB1232700D 1968-12-17 1968-12-17 Expired GB1232700A (enrdf_load_stackoverflow)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5990968 1968-12-17

Publications (1)

Publication Number Publication Date
GB1232700A true GB1232700A (enrdf_load_stackoverflow) 1971-05-19

Family

ID=10484629

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1232700D Expired GB1232700A (enrdf_load_stackoverflow) 1968-12-17 1968-12-17

Country Status (1)

Country Link
GB (1) GB1232700A (enrdf_load_stackoverflow)

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees