| 发明名称 |
METHOD OF AND APPARATUS FOR SURVEYING AN AREA |
| 摘要 |
<p>A security system for surveying an area such as a prison or airport, the security system comprising three radiating cables which are placed in the ground parallel to and spaced apart from each other, the centre cable being provided with a modulated signal which is received by the outer two cables, and the received signal being caused to vary and trigger an alarm if there is an unauthorized movement in the surveyed area.</p> |
| 申请公布号 |
CA1050133(A) |
申请公布日期 |
1979.03.06 |
| 申请号 |
CA19750242753 |
申请日期 |
1975.12.30 |
| 申请人 |
PLESSEY HANDEL UND INVESTMENTS AG. |
发明人 |
TORLESSE, ARTHUR T.;BOVILL, ANTHONY W.;WEST, ROBERT C. |
| 分类号 |
G08B13/24;(IPC1-7):08B13/24 |
主分类号 |
G08B13/24 |
| 代理机构 |
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代理人 |
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| 主权项 |
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| 地址 |
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