The Emerson-Brantingham Implement Co. of Rockford, Illinois was formed in 1909, following Charles Brantingham's appointment as president of the Emerson Manufacturing Company, which produced reapers, ploughs and other tillage equipment. The purchase of a number of other companies in 1912, including Reeves & Co., the Gas Traction Co., Rockford Engine Works and the Geiser Manufacturing Co., greatly expanded the range of products sold by E-B to include steam engines, threshing machines, gas engines as well as tractors. The Gas Traction Co. "Big Four" and the Reeves 40-65 were subsequently rebadged and sold as Emerson-Brantingham tractors for many years. It was not until 1916 that E-B developed their own tractor design - this was the Model L 12-20, a three-wheeled machine that later gave way to the four-wheeled Model Q 12-20. In 1918, the highly successful Model AA 12-20 was introduced, and production continued until the Emerson-Brantingham company was bought by the J.I. Case Co. in 1928.

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