| 摘要 |
A quadrilateral roofing tile wherein has two parallel sides present with their edges bent through 90° in opposite directions to engage under traction with a first adjacent tile by ribs and complementary seats, those edges are the seats being provided at their ends with apertures which can be superposed on portions of an adjacent second tile for engagement by roof fixing elements, and can be covered by that bent edge of the first adjacent tile which comprises the ribs.
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