Krupp attempted to build a whole line of artillery prime movers according to "Heeres" and their own commercial needs. In April 1938 they built the "Leichter Kettenschlepper", light tracked tractor, meant to tow up to 5 tons. They also endeavoured to construct the "Mittlerer Kettenschlepper", medium tractor, in march of the same year. It was to pull up to 8 tons. The last in the series, "Schwerer Kettenschlepper", heavy tractor, was able to tow 12 to 15 tons. Anyone can shed some light here? At least one of them was built, one initiated. How come this is ignored?