1927 Russell Grader.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...r_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...ell_grader.jpg
More: https://www.caterpillar.com/en/news/...years-ago.html
Previously:
https://www.homemadetools.net/forum/...540#post139409
https://www.homemadetools.net/forum/...396#post161930
https://www.homemadetools.net/forum/...345#post158165
https://www.homemadetools.net/forum/...338#post116485
