On 1st November 2021, Univ.-Prof. Dr.-Ing. Rolf Dieter Stoll (Figure 1), director emeritus of the Institute of Mining Engineering III at RWTH Aachen University, Aachen/Germany, passed away at the age of 88. Prof. Stoll studied mining at RWTH from 1954 onwards, after graduating from high school, completing a period of practical training as a miner in the USA, and graduating ...
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