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| All Patents in class 451/251 | |||||
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| 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 | |
| 2,623,429 | Dec. 30, 1952 | H.J. Siekmann, W.R. Meyer | Work Handling Appparatus for Machine Tools | metalworking machine mechanisms | |
| 2,706,872 | Apr. 26, 1955 | C.H. Drury, E.V. Flanders | Grinding Machine | thread grinders | |