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FR818975A - Burglar alarm system - Google Patents

Burglar alarm system

Info

Publication number
FR818975A
FR818975A FR818975DA FR818975A FR 818975 A FR818975 A FR 818975A FR 818975D A FR818975D A FR 818975DA FR 818975 A FR818975 A FR 818975A
Authority
FR
France
Prior art keywords
alarm system
burglar alarm
burglar
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)
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
Application granted granted Critical
Publication of FR818975A publication Critical patent/FR818975A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/181—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems
    • G08B13/183—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
FR818975D 1936-03-21 1937-03-09 Burglar alarm system Expired FR818975A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE818975X 1936-03-21

Publications (1)

Publication Number Publication Date
FR818975A true FR818975A (en) 1937-10-07

Family

ID=20345598

Family Applications (1)

Application Number Title Priority Date Filing Date
FR818975D Expired FR818975A (en) 1936-03-21 1937-03-09 Burglar alarm system

Country Status (1)

Country Link
FR (1) FR818975A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1143110B (en) * 1952-09-29 1963-01-31 Haegglund & Soener Ab Device for the automatic opening and closing of vehicle doors

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1143110B (en) * 1952-09-29 1963-01-31 Haegglund & Soener Ab Device for the automatic opening and closing of vehicle doors

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