FR1478754A - Fully transistorized horn actuated by electromagnetic waves - Google Patents
Fully transistorized horn actuated by electromagnetic wavesInfo
- 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
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)
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)
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 |
-
1966
- 1966-04-29 FR FR59654A patent/FR1478754A/en not_active Expired
Cited By (3)
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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