In the early 20th century, automobile production proliferated throughout Michigan, but most notably in Detroit. Other Michigan cities became suppliers to Detroit factories, sometimes with factories of their own. In Saginaw, the Jackson-Church-Wilcox Company began as a partnership in 1906 for producing steering gear under the "Jacox" brand. Jackson-Church-Wilcox was acquired by Buick in 1909, and as part of General Motors became the Jackson, Church and Wilcox Division, the first GM division devoted to parts production. In 1919 the Jacox division was merged with Saginaw Malleable Iron and Central Foundry into GM's Saginaw Products Company. This formed the basis for the Saginaw Steering Gear Division, created in 1928. General Motors and other manufacturers established foundries and other automobile-related manufacturing facilities in Saginaw, for the production of chemicals and plate glass, as well as metal fabrication. This early development of a symbiotic relationship with the auto industry set the course for the future of the city.