The Schwimmwagen reference article from the English Wikipedia on 24-Apr-2004
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Schwimmwagen

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The VW-Schwimmwagen was an amphibious vehicle which was mechanically a KdF-Wagen (later known as a VW Beetle), and was produced by the factory at KdF-Stadt (Wolfsburg). Erwin Komenda, Ferdinand Porsche's first car body designer, developed the car body construction. Komenda patented his ideas for the swimming car at the German Patent office.

A few four-wheel-drive versions were made.