Folding stair 5
Turn the orange handle to lift and fold the stair.
Blue connecting rods, upper and lower parts of the stair create a four-bar linkage.
Видео Folding stair 5 канала thang010146
Blue connecting rods, upper and lower parts of the stair create a four-bar linkage.
Видео Folding stair 5 канала thang010146
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