AUTO UNION links

Auto Union was a joint venture of four German automobile manufacturers, established in 1932 in Zwickau, Saxony, during the Great Depression. The trademark of Auto Union was a symbol of four overlapping rings, symbolizing the four member companies (all four in a line, in an attempt to avoid confusion with the 5 Olympic rings). The trademarks and company names of the member companies - Horch, Audi, DKW and Wanderer - were continued; the four ring logo was used only in racing. The four ring logo of Auto Union is still a trademark, and now used by Audi. It is best known for its racing team (Auto Union Rennabteilung, based in Zwickau), which was the main opponent of Mercedes-Benz in 1930s Grand Prix motor racing. The Silver Arrows of these two teams dominated not only 1930s car racing, but set records that would take decades to beat. For example, it took Formula One Grand Prix until the early 1980s to again reach the power levels of these cars. http://en.wikipedia.org/wiki/Auto_Union