| 摘要 |
The subject of the invention is a method and a device for protecting sensitive sites 2/3/4, characterised in that it is composed of at least one pylon 1, carrying, at its upper end, retractable means 7, which means are actuated as soon as the alert is given to generate above and/or around the area of the site an obstacle to any crossing of the space which surrounds the site and for retracting these means 7 as soon as the alert has passed in order to return the site to the state it was in before the alert was given. <IMAGE>
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