GB277362A - Improvements in or relating to fire alarm systems - Google Patents

Improvements in or relating to fire alarm systems

Info

Publication number
GB277362A
GB277362A GB23786/27A GB2378627A GB277362A GB 277362 A GB277362 A GB 277362A GB 23786/27 A GB23786/27 A GB 23786/27A GB 2378627 A GB2378627 A GB 2378627A GB 277362 A GB277362 A GB 277362A
Authority
GB
United Kingdom
Prior art keywords
relay
alarm
relays
energized
loop
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
GB23786/27A
Other languages
English (en)
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of GB277362A publication Critical patent/GB277362A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire Alarms (AREA)
  • Alarm Systems (AREA)
GB23786/27A 1926-09-11 1927-09-09 Improvements in or relating to fire alarm systems Expired GB277362A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE277362X 1926-09-11

Publications (1)

Publication Number Publication Date
GB277362A true GB277362A (en) 1928-12-10

Family

ID=20306920

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23786/27A Expired GB277362A (en) 1926-09-11 1927-09-09 Improvements in or relating to fire alarm systems

Country Status (6)

Country Link
US (1) US1977121A (xx)
BE (1) BE345223A (xx)
DE (1) DE574151C (xx)
FR (1) FR640950A (xx)
GB (1) GB277362A (xx)
NL (1) NL22554C (xx)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2479621A (en) * 1945-03-05 1949-08-23 Jackson Harry Magnetically operated switch
US2492043A (en) * 1948-04-03 1949-12-20 Protectowire Co Of Maine Fire alarm system
NL85577C (xx) * 1950-12-04
US2724105A (en) * 1952-05-28 1955-11-15 Ekman Olof Ingemar Harald Electric control or alarm systems
US3044050A (en) * 1959-08-17 1962-07-10 Mc Graw Edison Co Fire detection system

Also Published As

Publication number Publication date
BE345223A (xx)
NL22554C (xx)
FR640950A (fr) 1928-07-24
US1977121A (en) 1934-10-16
DE574151C (de) 1933-04-10

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