FR930976A - Electromagnetic signaling device - Google Patents
Electromagnetic signaling deviceInfo
- 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
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)
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)
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 |
-
1946
- 1946-04-26 FR FR930976D patent/FR930976A/en not_active Expired
Cited By (2)
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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