| 摘要 |
In cross section, the tongue of a cladding panel has on its bottom face and the bottom lip of the groove has on its top face, respectively, a second raised portion projecting downward and a complementary second recess shaped so that the second raised portion of the tongue on one panel inter-engages with the second recess of the groove of an adjacent panel when one panel is turned relative to the other, to form second element of clipping the tongue into the groove.
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