| 摘要 |
It consists of a monolithic composite shell 1, 3, 4 which is transparent or deformable and clipped or fastened at several easily accessible detachable fixing points 8 to a head frame 5 carrying the comfort lining 9 and the retaining device. It is intended to allow, after detection of a knock owing to the transparency or deformation of the shock-absorbing element, the unusable shell to be changed. <IMAGE>
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