Deutz AG was one of the first German companies to introduce production lines. Production of small engines on an oval line began in Cologne in the summer of 1925.
Fließbandfertigung bei Deutz, Cologne, black-and-white photograph, ca. 1925, unknown photographer; source: Stiftung Rheinisch-Westfälisches Wirtschaftsarchiv zu Köln, Sign. RWWA 107-F2649.