FR831810A - Improvements to electrical alarm systems - Google Patents

Improvements to electrical alarm systems

Info

Publication number
FR831810A
FR831810A FR831810DA FR831810A FR 831810 A FR831810 A FR 831810A FR 831810D A FR831810D A FR 831810DA FR 831810 A FR831810 A FR 831810A
Authority
FR
France
Prior art keywords
alarm systems
electrical alarm
electrical
systems
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
Olof Ingemar Harald Ekman
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 FR831810A publication Critical patent/FR831810A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
FR831810D 1937-01-09 1938-01-08 Improvements to electrical alarm systems Expired FR831810A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE2249891X 1937-01-09

Publications (1)

Publication Number Publication Date
FR831810A true FR831810A (en) 1938-09-15

Family

ID=20425109

Family Applications (1)

Application Number Title Priority Date Filing Date
FR831810D Expired FR831810A (en) 1937-01-09 1938-01-08 Improvements to electrical alarm systems

Country Status (3)

Country Link
US (1) US2249891A (en)
DE (1) DE732994C (en)
FR (1) FR831810A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2636163A (en) * 1951-04-19 1953-04-21 Earle V Gardiner Burglar alarm system
US3401234A (en) * 1965-04-16 1968-09-10 Rimac Ltd Combined audio program and alarm signaling system with line supervision
GB1123607A (en) * 1965-12-28 1968-08-14 American District Telegraph Co Electrical protection system
US4529316A (en) * 1982-10-18 1985-07-16 Robotic Vision Systems, Inc. Arrangement of eliminating erroneous data in three-dimensional optical sensors

Also Published As

Publication number Publication date
DE732994C (en) 1943-03-17
US2249891A (en) 1941-07-22

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