| 摘要 |
PROBLEM TO BE SOLVED: To provide stairs capable of being built even by a small number of workers without using heavy equipment such as a crane. SOLUTION: The stairs U1 comprise one or plural kinds of stair component materials (tread member 11 and connecting member 12). These stair component materials are formed by an extrusion material. The stair component materials are engaged with engagement parts 26, 27, 28, 29 continued on the longitudinal direction, and further firmly connected with each other.
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