| 摘要 |
The device comprises a first bracket 2 and a second bracket 3 spaced apart from one another and connected via a suspension bar 14. The brackets are fixed on the roof via their upper end 5 which is attached to a rafter 4. The operator 23 is suspended from the suspension bar 14 in a cradle 25 to which he is secured by a fastening means 26, in such a way that he can move along the roof edge. <IMAGE>
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