History
The first self-propelled grader was made by the Russell Grader Manufacturing Company in 1920: the Russell Motor Hi-Way Patrol. Early graders such as this were propelled by separate tractor units, with the grader blade as an attachment. After purchasing the company in 1928 Caterpillar went on to integrate the tractor and grader into one design - at the same time replacing crawler tracks with wheels to yield the first rubber-tyre self-propelled grader, the Caterpillar Auto Patrol, released in 1931.
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