Allis-Chalmers DD grader of the 1950s. In the 1940s, Allis-Chalmers launched a new grader called the model 'D' to replace the former model 'W' tractor-mounted type at the lower end of its motor-grader ...
The pull grader was the standard machine for road maintenance from the mid-1800s until motor graders rendered them obsolete in the 1930s, and several elements factored into their design: Drawbar. The ...
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