发明授权
US06155006A Horizontal-roofing and mounting method thereof 失效
水平屋顶及其安装方法

Horizontal-roofing and mounting method thereof
摘要:
A roof in which an upper-end engaging portion of a downstream roof panel is seam-jointed with a lower-end engaging portion of an upstream roof panel, wherein at least the lower-end engaging portion has flexural rigidity enough to disengage the seam joint.
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