In 1933, Ludwig Nachtmann established a factory for the manufacture of screws, the Präzifix GmbH, on Munich Strasse in Dachau. From the beginning of the war, special screws for aircraft engines were produced at the factory. In 1940, Gustav Adolf Heyer from Berlin took over the firm.1 The next year, he relocated production to a new factory that had been constructed at 2–3 Johann-Ziegler Strasse (Factory I). At the end of 1941, Präzifix GmbH, an important supplier for the Messerschmitt factories and Bayerische Motoren Werke (BMW), received permission to establish Factory II on the Flosslände at the SS camp site. The existing munitions bunkers were connected by one-story barracks, in which only Dachau concentration camp prisoners and a few civilian workers could be found working. Even before a Dachau subcamp was constructed on the factory grounds at the Flosslände, 12 prisoners had worked in 1940 for the Präzifix GmbH on Munich Strasse.2 However, these prisoners returned each evening t...