| All Patents in class 91/275 |
Patents 1 -
12
of 12
      |
| Number | Date | Patentee | Title | Type |
| 627,385 | Jun. 20, 1899 | J. Brockie | Automatic Lathe | automatic lathes |
| 1,125,204 | Jan. 19, 1915 | R.C. Stevens | Engine Valve Gear | steam engine valve gear |
| 1,840,231 | Jan. 05, 1932 | F.S. Haas, R.E. Harrison | Grinding Machine | grinding machines |
| 1,938,762 | Dec. 12, 1933 | F.S. Haas | Grinding Machine | cylindrical grinders |
| 2,009,487 | Jul. 30, 1935 | R. Thoreson, W. Ernst | Hydraulic Press | hydraulic presses |
| 2,051,052 | Aug. 18, 1936 | E.K. Morgan | Machine Tool Hydraulic Control System | hydraulic apparatus |
| 2,247,479 | Jul. 01, 1941 | H.J. Caldwell | Honing machine | honing machines |
| 2,442,635 | Jun. 01, 1948 | R.D. Bennett | Spline or gear grinder | gear making machines |
| 2,470,415 | May 17, 1949 | E.Y. Seborg | Drive mechanism | |
| 2,775,235 | Dec. 25, 1956 | W.F. Jessup | Booster for Template Controlled Truing Mechanism | grinder dressers |
| 2,840,956 | Jul. 01, 1958 | C.M. Grinage | Grinding Machine | |
| 3,060,466 | Oct. 30, 1962 | A.G. Kozacka | Controls for turret lathes and the like | turret lathes |
