FR930976A - Electromagnetic signaling device - Google Patents

Electromagnetic signaling device

Info

Publication number
FR930976A
FR930976A FR930976DA FR930976A FR 930976 A FR930976 A FR 930976A FR 930976D A FR930976D A FR 930976DA FR 930976 A FR930976 A FR 930976A
Authority
FR
France
Prior art keywords
signaling device
electromagnetic signaling
electromagnetic
signaling
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
Alexandre-Etienne Racz
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 FR930976A publication Critical patent/FR930976A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/28—Dispenser-type cathodes, e.g. L-cathode
    • 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)
FR930976D 1946-04-26 1946-04-26 Electromagnetic signaling device Expired FR930976A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR930976T 1946-04-26

Publications (1)

Publication Number Publication Date
FR930976A true FR930976A (en) 1948-02-10

Family

ID=9450040

Family Applications (1)

Application Number Title Priority Date Filing Date
FR930976D Expired FR930976A (en) 1946-04-26 1946-04-26 Electromagnetic signaling device

Country Status (1)

Country Link
FR (1) FR930976A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE962587C (en) * 1952-11-15 1957-04-25 Wilhelm Kengelbach Fire, accident and safety alarm system
US3439358A (en) * 1965-11-30 1969-04-15 George Washington Ltd Activity detectors

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE962587C (en) * 1952-11-15 1957-04-25 Wilhelm Kengelbach Fire, accident and safety alarm system
US3439358A (en) * 1965-11-30 1969-04-15 George Washington Ltd Activity detectors

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