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| All Patents in class 451/485 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 1,560,507 | Nov. 03, 1925 | A.F. Froussard | Grinder | ||
 | 1,576,593 | Mar. 16, 1926 | A.F. Froussard | Cylinder hone | |
| 2,171,417 | Aug. 29, 1939 | E.M. McGovern, P. Schrick | Crankshaft grinding tool | ||
| 2,195,493 | Apr. 02, 1940 | E.M. McGovern, P. Schrick | Crankshaft grinder | ||
| 2,209,307 | Jul. 30, 1940 | F. Esz, A.H. Dall | Surface Finishing Machine | ||