| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
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| Mülheim an der Ruhr |
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(mül´h m än d r r r) (KEY) or Mülheim, city (1994 pop. 177,175), North Rhine–Westphalia, W Germany, on the Ruhr River. It is an industrial center of the Ruhr district and a road and rail traffic hub. The city formerly produced mainly coal and steel, but in the mid-20th cent. its products were diversified to include machinery, electrical goods, and chemicals. At the city’s noted institute for coal research, the Fischer-Tropsch process for coal liquification and the Ziegler process for the production of polyethylene plastics were discovered. Mülheim was chartered in 1808. There is a 12th-century castle in the city. |
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| | | The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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