History Early evolution of combine harvesters – professors at the univer-sity of Bonn and the Claas company

In the first half of the 20th century, the evolution from stationary threshing towards mobile combine harvesters began in German-speaking countries. The cooperation between the Claas company and professors at that time in the Institute of Agricultural Engineering (ILT) played a leading role. The information is based on the publications by Professors Vormfelde, Brenner and Dencker from 1910 - 1931. There is no joint publication with August Claas, who was largely responsible for technical product development at Claas, but the sources provide a contemporary insight into the situation and discussion surrounding the implementation of combine threshing in Germany.