CO-OP farm tractors by year

CO-OP E4 tractorThe CO-OP brand of tractors was born out of a desire by farmers to reduce cost through collective ownership of machinery production. Early models were designed by Dent Parrett, formely of Parrett Tractor, and built in Michigan using a number of Chrysler components. In 1938, production moved to new facilities in Indiana. Cletrac also contributed a few models and some production occured in Saint Paul, Minnesota, at this time. After World War II, an arrangement with Cockshutt led to the new "E" series of CO-OP tractors which were simply re-branded Cockshutt models. Poor sales led to the CO-OP facilities being sold to Cockshutt in 1952, and the CO-OP brand was discontinued.

CO-OP history - article at Lancaster Farming

Sort tractors by Model, Factory or Series
235 hp[P]1936 - 1946
341 hp[P]1936 - 1950
1unknown1937 - 1938
B2unknown1939 - 1941
G20 hp[B]1939 - 1941
B120 hp[B]1941 - 1942
E331 hp[P]1946 - 1957
3Sunknown1948 - 1951
E447 hp[P]1949 - 1958
E233 hp[P]1952 - 1953
E554 hp[B]1953 - 1957
B2 Jr.37 hp[P]unknown
[B]: Engine power estimated from belt horsepower. [P]: Engine power estimated from PTO horsepower. See individual tractor data listing for power details.

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