| All Patents in class 451/275 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 457,866 | Aug. 18, 1891 | J. Messaz | Lapidary's Tool | jewelers lathes |
| 686,599 | Nov. 12, 1901 | E.R. Fellows | Machine for Grinding Gear Generating Cutters | tool grinders |
| 1,612,830 | Jan. 04, 1927 | C.G. Olson | Grinding machine | gear hobbing machines |
| 1,666,955 | Apr. 24, 1928 | H.H. Asbridge | Grinding of Gear-Wheel Teeth | gear grinding machines |
| 1,698,953 | Jan. 15, 1929 | L.W. Moulton, O.C. Kavle | Gear-Finishing Machine | gear making machines |
| 1,920,073 | Jul. 25, 1933 | G. Gorton | Grinding Machine and the Like | tool grinders |
