The estate of Prof. Prinz (*1907 – †1978) covers the period from 1926 to 1978. It contains numerous documents related to his teaching and research activities at the Technical University of Munich (TH München). In 1946, Prof. Prinz was appointed to the professorship of High Voltage and Plant Engineering at the Faculty of Electrical Engineering. For thirty years, he headed the Institute of High Voltage and Plant Engineering until his retirement in 1976.