桅杆完全抬起时，堆放区域上方是否有足够的净空？过道或行驶路线上的任何高架障碍物。这将确定是否需要自由升降或三重门架。
Is there sufficient clear headroom over the stacking area with the mast fully raised? Any overhead obstructions either in the aisle or on the travelling route. This will determine whether free lift or triplex masts are necessary.
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