NL7208873A - - Google Patents
Info
- Publication number
- NL7208873A NL7208873A NL7208873A NL7208873A NL7208873A NL 7208873 A NL7208873 A NL 7208873A NL 7208873 A NL7208873 A NL 7208873A NL 7208873 A NL7208873 A NL 7208873A NL 7208873 A NL7208873 A NL 7208873A
- Authority
- NL
- Netherlands
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/16—Actuation by interference with mechanical vibrations in air or other fluid
- G08B13/1654—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems
- G08B13/1681—Actuation by interference with mechanical vibrations in air or other fluid using passive vibration detection systems using infrasonic detecting means, e.g. a microphone operating below the audible frequency range
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Geophysics And Detection Of Objects (AREA)
- Burglar Alarm Systems (AREA)
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7208873A NL7208873A (en) | 1972-06-28 | 1972-06-28 | |
| DE19732329593 DE2329593A1 (en) | 1972-06-28 | 1973-06-09 | AREA SURVEILLANCE SYSTEM WITH AT LEAST ONE MICROPHONE THAT IS ACOUSTICALLY CONNECTED TO AT LEAST ONE PIPE |
| IT6889273A IT986585B (en) | 1972-06-28 | 1973-06-25 | COM AREA SECURITY SYSTEM TAKING AT LEAST ONE AC MICROPHONE PAIRED ACOUSTICALLY WITH AN UNDERGROUND TU BO |
| JP48070903A JPS4986036A (en) | 1972-06-28 | 1973-06-25 | |
| FR7323346A FR2191180B1 (en) | 1972-06-28 | 1973-06-26 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7208873A NL7208873A (en) | 1972-06-28 | 1972-06-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL7208873A true NL7208873A (en) | 1974-01-02 |
Family
ID=19816393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL7208873A NL7208873A (en) | 1972-06-28 | 1972-06-28 |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS4986036A (en) |
| DE (1) | DE2329593A1 (en) |
| FR (1) | FR2191180B1 (en) |
| IT (1) | IT986585B (en) |
| NL (1) | NL7208873A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2560701B1 (en) * | 1984-03-05 | 1987-04-17 | Sogesec Sarl | DIFFERENTIAL PRESSURE ACCESS DETECTOR |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1267874A (en) * | 1960-06-14 | 1961-07-28 | Wattson Sa | Method and device for detecting crossing locating |
| IL29843A (en) * | 1967-08-24 | 1971-07-28 | Westinghouse Electric Corp | Intruder detecting apparatus |
-
1972
- 1972-06-28 NL NL7208873A patent/NL7208873A/xx unknown
-
1973
- 1973-06-09 DE DE19732329593 patent/DE2329593A1/en active Pending
- 1973-06-25 IT IT6889273A patent/IT986585B/en active
- 1973-06-25 JP JP48070903A patent/JPS4986036A/ja active Pending
- 1973-06-26 FR FR7323346A patent/FR2191180B1/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS4986036A (en) | 1974-08-17 |
| FR2191180B1 (en) | 1976-09-17 |
| IT986585B (en) | 1975-01-30 |
| DE2329593A1 (en) | 1974-01-10 |
| FR2191180A1 (en) | 1974-02-01 |