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Mannesmann Demag

DEMAG is a German heavy equipment manufacturer. It started making dock cranes in 1906 and since constituted as Deutsche Maschinenfabrik AG or simply Demag. In 1954, Demag developed their first hydraulic excavators. Demag would soon expand into construction machines, vehicle cranes, moving and conveying engineering (workshop crane and control devices), steel mill technology (complete metallurgical plants, in particular continuous casting equipment), compressors, and compressed air engineering. The company also became a world leader in the manufacturing of injection moulding machines.

In 1973 the ownership of Demag was assumed by the Mannesmann group, based in Düsseldorf. In 1983 Mannesmann-Demag AG and Wean United, Inc. of Pittsburgh, United States, founded a daughter company to produce steel working equipment, Mannesmann Demag Wean Co. A joint venture with the Japanese manufacturer Komatsu led to spinning off of the large-scale excavation operations and their renaming as Komatsu Mining.