NSU was founded in 1873 in Riedlingen, on the Danube, by the two Swabian mechanics Christian Schmidt and Heinrich Stoll. Like other companies, they produced bicycles. On March 10th 1969, Auto Union GmbH of Ingolstadt merged with NSU Motorenwerke AG, of Neckarsulm. The new company bearing the name Audi NSU Auto Union AG.

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