| 摘要 |
<p>Abstract A hardwood stair tread has a nose with a corner in its reverse face which receives a riser in the finished staircase and is rendered non-slip by the inclusion of a channel in the contact face of the tread and a ribbed plastic strip in the channel the exposed face of the strip being slightly above the surrounding tread surface. 2~~. FR> I a' * U A C"' - . .7~. ,* 7 7 7' -N "-4 '-N 4- "N (4<., ~$K</p> |
