| 摘要 |
PROBLEM TO BE SOLVED: To overcome two stages of stepped parts by use of one elevation unit. SOLUTION: An outdoor side stepped part 7 is provided between the ground 1 and an entrance floor 2 while an indoor side stepped part 8 between the floor 2 and a building floor 3. An accommodation recessed part 9 is formed on the floor 2 while an elevation unit 6 is provided in the part 9, and a moving table 15 movable in the horizontal direction is provided at an elevation table of the unit 6.
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