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In page Zwickau:

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Two major industrial facilities of the Soviet SDAG Wismut were situated in the city: the uranium mill in Zwickau-Crossen, producing uranium concentrate (known as "yellow cake") from ores mined in the Erzgebirge and Thuringia, and the machine building plant in Zwickau-Cainsdorf producing equipment for the uranium mines and mills of East Germany. Uranium milling ended in 1989, and after the unification the Wismut machine building plant was sold to a private investor.