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Prof Dr lng. Heinrich Hertel celebrated his 75th birthday on 13th November 1976. He was born in Düsseldorf, went to school in Magdeburg, passed his preliminary examination for civil engineering in 1923 at the Technical University in Munich and graduated in 1926. He was awarded his doctorate for engineering at the Technical University, Berlin, in 1931. Heinrich Hertel had already begun his scientific work at the German Institute of Research for Aviation in Berlin Adlershof five years earlier. In 1933 he left Aldershof and joined Prof Dr Ernst Heinkel as chief technical assistant. One year later he was appointed technical director of the Heinkel‐Werke. In 1938 he was made honorary professor. In 1939 he was nominated into the board of management of Junkers Flugzeug‐ und Motorenwerke AG, Dessau, as head of aircraft development.