[go: up one dir, main page]

FR923058A - Improvements to alarm devices - Google Patents

Improvements to alarm devices

Info

Publication number
FR923058A
FR923058A FR923058DA FR923058A FR 923058 A FR923058 A FR 923058A FR 923058D A FR923058D A FR 923058DA FR 923058 A FR923058 A FR 923058A
Authority
FR
France
Prior art keywords
alarm devices
alarm
devices
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.)
FRILI AB
Original Assignee
FRILI 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 FRILI AB filed Critical FRILI AB
Application granted granted Critical
Publication of FR923058A publication Critical patent/FR923058A/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
    • G08B13/22—Electrical actuation
    • G08B13/24—Electrical actuation by interference with electromagnetic field distribution
    • G08B13/2491—Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
FR923058D 1945-10-25 1946-03-01 Improvements to alarm devices Expired FR923058A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK923058X 1945-10-25

Publications (1)

Publication Number Publication Date
FR923058A true FR923058A (en) 1947-06-26

Family

ID=8154035

Family Applications (1)

Application Number Title Priority Date Filing Date
FR923058D Expired FR923058A (en) 1945-10-25 1946-03-01 Improvements to alarm devices

Country Status (1)

Country Link
FR (1) FR923058A (en)

Similar Documents

Publication Publication Date Title
FR938765A (en) Improvements to stop rings
FR933208A (en) Improvements to vibratory devices
FR935936A (en) Improvements to stop rings
FR916843A (en) Improvements to electrotherapy devices
FR938471A (en) Improvements to electrolysis devices
FR932782A (en) Improvements to evaporators and similar devices
FR923058A (en) Improvements to alarm devices
FR909914A (en) Improvements to devices for the destruction of winged insects
FR934385A (en) Improvements to indicating and recording devices
FR939521A (en) Improvements to spraying devices
FR931035A (en) Improvements to electrotherapy devices
FR920883A (en) Stopcock
FR923060A (en) Alarm device
FR932569A (en) Self-compressing gasifier
FR919366A (en) Improvements to fire detectors
FR997369A (en) Improvements to projection devices
FR933230A (en) Matchbooks
FR938314A (en) Improvements relating to electrical indicating devices
FR940883A (en) Improvements to telecinematographic devices
FR939362A (en) Improvements to indicating devices
FR916510A (en) Improvements to the templets
AT170589B (en) Elbow
FR939113A (en) Improvements to induction devices
FR909562A (en) Improvements to sanitary devices
FR911762A (en) Improvements to cinematographic devices