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| All Patents in class 74/323 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 446,148 | Feb. 10, 1891 | A.B. Landis | Grinding-machine | |
 | 718,514 | Jan. 13, 1903 | J. Parker | Feed-tripping mechanism | |
 | 930,620 | Aug. 10, 1909 | J.R. Sandberg | Combined breast-drill and valve-grinder | |
| 933,945 | Sep. 14, 1909 | A.W. Aitken | Gearing for Traction Engines | ||
 | 963,986 | Jul. 12, 1910 | F.C. Blanchard | Combination drill and valve-grinder | |
 | 977,258 | Nov. 29, 1910 | O.R. Angell | Combined valve grinder and drill | |
 | 1,693,437 | Nov. 27, 1928 | G.O. Leopold, T.J. Fegley | Valve grinder | |