Finnish Military attaché at Berlin produced an interesting report of the Zeltbahn 31 itself and the printing process of the pattern at Martin Günther G.m.b.H, Berlin. Along with the report was also a copy of the Splittermuster patent document from year 1929/1932. The report contains quite interesting bits of information I have not found from the literature (or maybe I have being reading the wrong books?).
It states that the first production runs were constructed from Egyptian Mako cotton but later this was replaced with inferior Peruvian (Pima?) cotton and it was clear already at this point that they would have to mix artificial fibres to the fabric in near future.