| All Patents in class 451/219 |
Patents 1 -
10
of 12
      |
| Picture | Number | Date | Patentee | Title |
 | 621,519 | Mar. 21, 1899 | W.G. Burnham | Gear-cutting machine |
| | 957,935 | May 17, 1910 | C.M. Conradson | Grinding Machine Feeding Mechanism |
 | 1,612,830 | Jan. 04, 1927 | C.G. Olson | Grinding machine |
| | 1,698,953 | Jan. 15, 1929 | L.W. Moulton, O.C. Kavle | Gear-Finishing Machine |
 | 2,111,045 | Mar. 15, 1938 | R.S. Drummond | Lapping machine |
| | 2,456,410 | Dec. 14, 1948 | S.G. Brady, I.J. Gruenberg | Gear Grinding Machine |
| | 2,520,879 | Aug. 29, 1950 | A.H. Dall | Lubricating System |
| | 2,560,967 | Jul. 17, 1951 | F. Lohutko | Apparatus for Grinding Gears and Gear Cutters |
| | 2,595,591 | May 06, 1952 | F. Lohutko | Apparatus for Grinding Helical Gears |
 | 2,607,175 | Aug. 19, 1952 | J.J. Osplack | Method of making precision gears |
