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a city in the Federal Republic of Germany, in the Land of North Rhine-Westphalia, located on the Ruhr River. Population, 192,200 (1971). It is a major center of heavy industry in the Ruhr Valley. The iron and steel industry is the most important, and the Thyssen and Rheinstahl concerns have plants there. Miilheim’s other industries include general machine building, electrical engineering, precision mechanical and optical equipment, and chemical, garment, footwear, and food-processing enterprises. The coal mines in the area were closed in 1966. The city is a railroad and highway junction; the river port’s freight turnover was 700,000 tons in 1971.