FR1478754A - Fully transistorized horn actuated by electromagnetic waves - Google Patents

Fully transistorized horn actuated by electromagnetic waves

Info

Publication number
FR1478754A
FR1478754A FR59654A FR59654A FR1478754A FR 1478754 A FR1478754 A FR 1478754A FR 59654 A FR59654 A FR 59654A FR 59654 A FR59654 A FR 59654A FR 1478754 A FR1478754 A FR 1478754A
Authority
FR
France
Prior art keywords
electromagnetic waves
fully transistorized
horn
actuated
horn actuated
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
FR59654A
Other languages
French (fr)
Inventor
Shigeo Matsuda
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
Priority to FR59654A priority Critical patent/FR1478754A/en
Application granted granted Critical
Publication of FR1478754A publication Critical patent/FR1478754A/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)
FR59654A 1966-04-29 1966-04-29 Fully transistorized horn actuated by electromagnetic waves Expired FR1478754A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR59654A FR1478754A (en) 1966-04-29 1966-04-29 Fully transistorized horn actuated by electromagnetic waves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR59654A FR1478754A (en) 1966-04-29 1966-04-29 Fully transistorized horn actuated by electromagnetic waves

Publications (1)

Publication Number Publication Date
FR1478754A true FR1478754A (en) 1967-04-28

Family

ID=8607458

Family Applications (1)

Application Number Title Priority Date Filing Date
FR59654A Expired FR1478754A (en) 1966-04-29 1966-04-29 Fully transistorized horn actuated by electromagnetic waves

Country Status (1)

Country Link
FR (1) FR1478754A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2645307A1 (en) * 1989-04-04 1990-10-05 Boudes Jacques Electronic device for selective detection of persons
EP0541881A1 (en) * 1991-11-15 1993-05-19 Saqr Majed El Marry Intrusion detection apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2645307A1 (en) * 1989-04-04 1990-10-05 Boudes Jacques Electronic device for selective detection of persons
EP0541881A1 (en) * 1991-11-15 1993-05-19 Saqr Majed El Marry Intrusion detection apparatus
US5367288A (en) * 1991-11-15 1994-11-22 El Marry Saar M Portable alarm device for detecting objects transgressing distance thresholds

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