| All Patents in class 451/239 |
Patents 31 -
45
of 52
      |
| Number | Date | Patentee | Title | Type |
| 2,099,724 | Nov. 23, 1937 | S.A. Cogsdill | Machine for Grinding Tools | tool grinders |
| 2,111,271 | Mar. 15, 1938 | L.F. Nenninger | Apparatus for Lapping | lapping machines |
| 2,125,584 | Aug. 02, 1938 | E. Rotzoli | Adjusting Device for Machine Tools | metalworking machines |
| 2,135,894 | Nov. 08, 1938 | E.C. Head | Machine for forming spiral bevel gear cutters | sharpening machines |
| 2,232,229 | Feb. 18, 1941 | W.F. Groene | Crankpin Grinder | grinders |
| 2,254,010 | Aug. 26, 1941 | R.D. Wortendyke, C. Herfurth | Grinding Machine | grinding machines |
| 2,254,020 | Aug. 26, 1941 | A.J. Graf, C.L. Schulte | Cambering Mechanism for Grinding Machines | grinding machines |
| 2,259,472 | Oct. 21, 1941 | C. Johnson | Duplicator for machine tools | milling machine accessories |
| 2,292,875 | Aug. 11, 1942 | R.E. Flanders | Tool Carrier Control Mechanism | thread grinders |
| 2,400,826 | May 21, 1946 | H.S. Jakobsen | Universal Grinder Head | grinding machines |
| 2,413,436 | Dec. 31, 1946 | O.W. Dawson | Grinding Machine | tool grinders |
| 2,451,137 | Oct. 12, 1948 | C.E. White | Contour grinding machine for work pieces each having a hollow spherical section | grinders |
| 2,526,844 | Oct. 24, 1950 | H.P. Boggis | Tap grinding machine | cutter grinding machines |
| 2,531,921 | Nov. 28, 1950 | R.A. Schultz | Surface finishing fixture | grinders |
| 2,641,874 | Jun. 16, 1953 | R.G. Kirby | Grinding Machine | cam grinding machines |
