Northwest Engineering manufactured Draglines and Cranes for over 70 years. They built a brand name and tradition that will live on forever as part of American History. Northwest Engineering Company was founded in 1917, by the Hartman-Greiling Company, of Chicago. The yard shifted to manufacturing cranes in 1920. It continued as a crane manufacturer until 1983, when it was taken over by Terex Corp. It closed in 1990. American entrepreneur Randolph W. Lenz purchased Terex USA from GM in 1986, then exercised an option to purchase Terex Equipment Limited in 1987. In 1988 Lenz merged his primary construction equipment asset, Northwest Engineering Company, into Terex Corporation, making Terex Corporation the parent corporation. The construction assets acquired by Lenz throughout the 1980s including Northwest Engineering Company, Unit Rig (brands Dart Truck Company), Terex Equipment Limited and Koehring Cranes and Excavators, Inc. all became assets of Terex Corporation.