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)

Similar Documents

Publication Publication Date Title
GB1338690A (en) Fire alarm system
GB1503006A (en) Alarm and utility meter reading system employing telephone lines
GB1548771A (en) Intruder alarm systems
GB856724A (en) Improvements in or relating to annunciators
US4150369A (en) Intrusion alarm system
GB1178957A (en) Improvements in and relating to Electrical Protective Systems
GB1270682A (en) Improvements in or relating to intruder alarm systems
GB1232700A (enrdf_load_stackoverflow)
US3924254A (en) Anti-intrusion alarm system
US3234535A (en) Combined burglar and fire alarm device
GB1265022A (enrdf_load_stackoverflow)
GB1345412A (en) Electrical alarm systems
GB691555A (en) Improvements in or relating to burglar alarms
GB1441618A (en) Alarm systems
GB1422394A (en) Warning systems
GB1242345A (en) Improvements in or relating to intruder alarm systems
GB1468962A (en) Monitoring installation
GB1271768A (en) Alarm device
GB1070468A (en) Improvements in or relating to alarm annunciators
GB1349742A (en) Combination burglar and fire alarm systems
GB827993A (en) Portable containers provided with theft alarm devices
GB1460281A (en) Electrical circuits
GB1515973A (en) Detector devices in particular anti-theft detector device
GB1414982A (en) Device responsive to the opening of a door
GB1294312A (en) Improvements in and relating to intruder alarm systems and apparatus therefor

Legal Events

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