1927 Russell Grader.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...r_fullsize.jpg
More: https://www.caterpillar.com/en/news/...years-ago.html
Previously:
Steam Tractor & Caterpillar Pull Grader or Tow Behind Grader
Britnell model of a horse drawn road grader
Road shoulder grader - GIF
Road shoulder grader - video
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