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It was also a time of strongly continuing mechanization on North American farms. At Allis-Chalmers, the 1920s brought yet more tractors, such as the 18-30, the 12-20, the 15-25, and the United tractor/Model U. Famed inventor and engineer Nikola Tesla spent the period 1919-1922 working in Milwaukee for Allis-Chalmers.