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The Allis-Chalmers HD-41 tractor - Contractor Magazine
Having led the charge for larger, higher horsepower tractors following WWII, Allis-Chalmers once again was at the forefront of large tractor development when the model HD-41 was released in 1970. By Richard Campbell. Allis-Chalmers had been working on a 'super dozer' for a number of years, with initial prototype machines appearing in 1963.