| All Patents in class 451/211 |
Patents 16 -
23
of 23
      |
| Number | Date | Patentee | Title | Type |
| 2,232,228 | Feb. 18, 1941 | W.L. Groene | Crankpin grinder | crank pin lathes |
| 2,232,229 | Feb. 18, 1941 | W.F. Groene | Crankpin Grinder | grinders |
| 2,257,195 | Sep. 30, 1941 | J.D. Rovick | Internal Gear Finishing Machine | gear making machines |
| 2,398,268 | Apr. 09, 1946 | J.C. Wilson | Machine Tool | machine tool controls |
| 2,424,347 | Jul. 22, 1947 | J.C. Wilson | Machine Tool for Cutting Surfaces of Irregular Shape | surface grinders |
| 2,559,180 | Jul. 03, 1951 | F.C. Victory | Jig Grinder | jig grinders |
| 3,099,849 | Aug. 06, 1963 | R.M. Bell, I. Jepson | Polishing and buffing apparatus | |
| 3,121,297 | Feb. 18, 1964 | S.G. Brady | Grinding Apparatus | grinders |
