| 摘要 |
A portable ladder is provided having at the base end of at least one of the uprights thereof a plurality of sucker elements, adapted to adhere strongly to the ground following the formation of vacuum beneath the elements. The ladder has at the base of the at least one upright a structure, which includes a cap, at the concave surface of the cap facing towards the surface on which the ladder rests there is fixed the plurality of sucker elements. |
