Werft Warnemünde des Flugzeugbau Friedrichshafen formed February 1917 as subsidiary of Friedrichshafen, building almost entirely marine aircraft including single- and twin-engined biplane and monoplane seaplanes. Dormant 1918, bought 1921 by Hugo Stinnes who produced boats, ice yachts and furniture, waiting for market to appear for aircraft. Hired designer Walter Rethel 1924 (in same year formed Ikarus as subsidiary), and began aircraft production 1925 renamed Arado.