| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide temporary intermediate stairs through which a person can safely move up and down in a dwelling building with a narrow working space by installing lower stairs and upper stairs to temporary intermediate stairs. <P>SOLUTION: The intermediate stairs are constituted by diagonally cutting the top of a square column to form a step and connecting the two square columns with the steps having different heights. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
