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This old ship elevator n°4 has also a 16.93m rise and was opened too in 1917. The elevators are double, consisting of two vertically mobile tanks or caissons, each supported in the center by an iron column. The two columns are hydraulically linked in such a way that one caisson rises as the other descends, the weight of one counterbalancing the weight of the other.Thieu - province of Hainaut - Wallonia - Belgium.