This tractor (chassis serial #15255) was built by the Allis-Chalmers Manufacturing Company at its tractor factory in West Allis, Wisconsin, a suburb of Milwaukee. Allis-Chalmers made the Model E 20-35 from 1923 to 1930 as the rerated successor to the 18-30. The 18-30's Nebraska Tractor Test, which led to a rerating of 20-35, was #83, performed from September 15th to September 24th, 1921. You can view the test results as a pdf here. The 20-35 was in turn succeeded by the 25-40.
Of the 16,862 total Model Es (rated 15-30, 18-30, 20-35, and 25-40), 14,276 of them 20-35s. The 20-35's Nebraska Tractor Test, which led to a rerating of 25-40, was #151, performed from June 18th to June 26, 1928. You can view the test results as a pdf here. You can view the advertising brochure that accompanied the 20-35 in 1928 as a pdf here. Stuhr Museum's Allis-Chalmers tractor was reportedly used to pull a four-bottom gang plow on a farm near Sutton, Nebraska, in Clay County, about 50 miles southeast of Grand Island.
Notes
Data, specs, and other information on Allis-Chalmers tractors can be found in Terry Dean, Allis-Chalmers Farm Tractors and Crawlers Data Book (St. Paul, MN: Motorbooks International, 2000). Information on the 20-35 can be found on pages 15-18.
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