Graubremse people – still patent-protected. However, Hans Hermann Voss did not return from Heidelberg empty-handed, but won an order for some fork heads. Fork heads are needed when redirecting and displacing [...] Graubremse people – still patent-protected. However, Hans Hermann Voss did not return from Heidelberg empty-handed, but won an order for some fork heads. Fork heads are needed when redirecting and displacing [...] more material bulging and a spring effect. This improved 9 The hall on the new site at Leiersmühle – empty but ready for occupancy. 8 labour force now needed to be retrained before they could be deployed on