Could someone explain to me what is "dural"?
A quite common misunderstanding is that "dural" comes from "dur" (latin for "hard") and "Al" for aluminium, because it is an alloy which could be hardened.
Actually dural has been inventen and named by by "
Dürener
Aluminiumwerke" (Düren Aluminium Works) in the west german city of Düren, located between Cologne and the Dutch/Belgium border.
Dural became famous when it was used for the Zeppelin structure around 1900.