| 摘要 |
Barrier having an arm (2) mounted on a support (3), this arm and this support having corresponding spaced regions (8, 9) designed to bear on one another, return means (11) pushing the arm and the support in the direction which holds the aforementioned corresponding regions bearing on one another, so that the arm occupies a stable position when these corresponding regions bear on one another and that it is returned into this stable position when it has been separated therefrom. <IMAGE>
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