| All Patents in class 74/323 |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 446,148 | Feb. 10, 1891 | A.B. Landis | Grinding-machine | grinders |
| 718,514 | Jan. 13, 1903 | J. Parker | Feed-tripping mechanism | milling machines |
| 930,620 | Aug. 10, 1909 | J.R. Sandberg | Combined breast-drill and valve-grinder | breast drills |
| 933,945 | Sep. 14, 1909 | A.W. Aitken | Gearing for Traction Engines | traction engine propulsion components |
| 963,986 | Jul. 12, 1910 | F.C. Blanchard | Combination drill and valve-grinder | eggbeater drills |
| 977,258 | Nov. 29, 1910 | O.R. Angell | Combined valve grinder and drill | eggbeater drills |
| 1,693,437 | Nov. 27, 1928 | G.O. Leopold, T.J. Fegley | Valve grinder | |
