| 摘要 |
PROBLEM TO BE SOLVED: To efficiently use a space under a staircase as a storage space even in the case of a box type, round staircase. SOLUTION: An additional door is provided to make it possible to deposit and deliver things deep in a storage room. Normally, this door is installed on the side of an external wall. It is possible to use a space under a staircase to the maximum as it is possible to deposit and deliver the things to and from both of the indoor side and the external wall side.
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