| All Patents in class 451/143 |
Patents 46 -
60
of 74
      |
| Number | Date | Patentee | Title | Type |
| 1,674,973 | Jun. 26, 1928 | C.F. Clark, A.L. Kline | Grinding Machine | internal grinders |
| 1,683,859 | Sep. 11, 1928 | F.P. Brown | Grinding machine | |
| 1,779,823 | Oct. 28, 1930 | C.H. Norton | Automatic Cylindrical grinding machine | cylindrical grinders |
| 1,877,505 | Sep. 13, 1932 | B.A. Kearns, F.S. Haas | Grinding Machine | grinding machines |
| 1,880,347 | Oct. 04, 1932 | K.L. Herrmann | Method of Grinding Bearing Races | grinders |
| 1,891,777 | Dec. 20, 1932 | A.G. Plimmer | Grinding Machine | grinding machines |
| 1,902,629 | Mar. 21, 1933 | W.F. Evans | Drum Truing Machine | |
| 1,907,938 | May 09, 1933 | T. Thorsen, A. Storm | Piston turning and grinding machine | automotive tools |
| 1,949,512 | Mar. 06, 1934 | C.H. Norton | Method of turning and grinding round work surfaces | cylindrical grinders |
| 1,989,792 | Feb. 05, 1935 | J.C. Drader | Automatic Machine Tool | tool grinders |
| 2,006,570 | Jul. 02, 1935 | F.S. Haas | Grinding Machinery | grinding machines |
| 2,090,992 | Aug. 24, 1937 | W.D. Archea | Thread Milling Machine | milling machines |
| 2,120,198 | Jun. 07, 1938 | R.G. Anderson, J.Y. Blazek | Valve grinder | vehicle mechanic |
| 2,187,227 | Jan. 16, 1940 | R.E. Flanders | Grinding Machine | cylindrical grinders |
| 2,192,888 | Mar. 12, 1940 | J.Y. Blazek, V.R. Roy | Resurfacing machine | vehicle brakes |
