According to various sources and literatur, the depiction of circumstances demonstrates that a decsision was taken in Berlin as to the up-sizing of the construction of combat air planes. In Dacember 1941 it was decided, to construct a clay end aluminium factory along the Drava and in January 1942 it was decided that the factory be built in Strnišče by Ptuj. Nevertheless, later, due to a change in the armamentstrategy, where army (land forces) with armoured armsments ware given precedence, along with the construction of submarines, as well as due to a lack of labour force, only the clay factory was built, with a yearly capacity of 100 thousand tonnes. Due to certain obstacles, particularly the lack of a labour force and of iron, the construction was not finished until 1954 in the renewed Yugoslavia, when the first clay and aluminium were processed and produced.