FR832277A - Improvements to automatic alarm systems - Google Patents

Improvements to automatic alarm systems

Info

Publication number
FR832277A
FR832277A FR832277DA FR832277A FR 832277 A FR832277 A FR 832277A FR 832277D A FR832277D A FR 832277DA FR 832277 A FR832277 A FR 832277A
Authority
FR
France
Prior art keywords
automatic alarm
alarm systems
systems
automatic
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
French (fr)
Inventor
Hans Teodor Nicou
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
Application granted granted Critical
Publication of FR832277A publication Critical patent/FR832277A/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
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/018—Sensor coding by detecting magnitude of an electrical parameter, e.g. resistance
    • 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)
  • Emergency Alarm Devices (AREA)
FR832277D 1937-01-20 1938-01-19 Improvements to automatic alarm systems Expired FR832277A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE202679X 1937-01-20

Publications (1)

Publication Number Publication Date
FR832277A true FR832277A (en) 1938-09-23

Family

ID=20304948

Family Applications (1)

Application Number Title Priority Date Filing Date
FR832277D Expired FR832277A (en) 1937-01-20 1938-01-19 Improvements to automatic alarm systems

Country Status (6)

Country Link
US (1) US2294043A (en)
BE (1) BE425857A (en)
CH (1) CH202679A (en)
DE (1) DE722085C (en)
FR (1) FR832277A (en)
NL (1) NL54631C (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1075019B (en) * 1960-02-04 Dragerwerk Hemr S. Bernh Drager Lübeck Electric remote temperature indicator for motor vehicles
US2636163A (en) * 1951-04-19 1953-04-21 Earle V Gardiner Burglar alarm system
US2696603A (en) * 1952-06-10 1954-12-07 Ekman Olof Ingemar Harald Two-wire alarm or control system
US3648268A (en) * 1969-11-03 1972-03-07 Melvin Paull Surveillance and alarm system

Also Published As

Publication number Publication date
DE722085C (en) 1942-06-30
CH202679A (en) 1939-01-31
NL54631C (en)
BE425857A (en)
US2294043A (en) 1942-08-25

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