One-of-a-kind 1913 prototype Bullock Creeping Grip crawler tractor with its rare Heer opposed-piston engine gets cranking.
With a weight of 70 tons and boasting 524 horsepower, the HD-41 crawler tractor made headlines as the largest built up to that time. Allis-Chalmers gave at-tendees a taste of things to come at the ...
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