| 摘要 |
The invention concerns a preformed roof cover element consisting essentially of a quadrilateral panel (1) with the shape of an isosceles trapezium whereof the two non-parallel sides (2 and 3) have rims (4 and 5), extending substantially over the whole length of said sides, said rims (4 and 5) raised on the same panel (1) side, the length of one of the trapezium bases (6) being substantially equal to that of the other base (7) increased by twice the thickness of said rim (4 and 5) wall so as to enable the rim (4 and 5) ends (8) to be engaged on the shortest base (7) side with the panel part bordered by said ends with a predetermined element between the ends (9) located at the longest base (6) side of another element extending in a projection of said predetermined element and parallel to said rims (4 and 5).
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