| 摘要 |
<p>A pit lid comprising a frame defining the perimeter of the pit lid, and a web bonded thereto, said web including a substantially planar core to each face of which is bonded a plurality of layers of reinforcing material, a layer of printable permeable tissue bonded to the outer face of the uppermost layer of reinforcing material, and a non-skid coating forming the topmost layer of the web of the pit lid, and a method of constructing said pit lid.</p> |
