Meurthe-et-Moselle. Do you know what the "RN52 Crosses" really are near Longwy?

With their monumental cross-like appearance, they frame the RN52, at the height of Mexy, on the road of the viaduct of the Chiers and the agglomeration of Longwy. They are not. But then what is the real origin of these two concrete structures? Answer with the Association for the industrial, mining and worker memory of the community of agglomeration of Longwy.