| All Patents in class 451/140 |
Patents 1 -
15
of 19
      |
| Number | Date | Patentee | Title | Type |
| 76,301 | Apr. 07, 1868 | E. Carrington, E.O. Carrington | Improvement in Machine for Grinding and Cutting Down Augers | making drills and augers |
| 293,398 | Feb. 12, 1884 | W.P. Barclay | Abrading Tool | lathe tools |
| 492,095 | Feb. 21, 1893 | P. Medart | Machine for grinding pulley-shafts and their couplings | grinders |
| 513,632 | Jan. 30, 1894 | R. Conrader | Machine for Grinding Spherical or Other Curved Surfaces | grinding machines |
| 667,321 | Feb. 05, 1901 | M.L. Keyes | Edge Tool Grinder | sharpening machines |
| 1,683,859 | Sep. 11, 1928 | F.P. Brown | Grinding machine | |
| 1,772,932 | Aug. 12, 1930 | S. Einstein | Grinding Machinery | grinding machines |
| 1,847,045 | Feb. 23, 1932 | W.H. Evans | Reamer sharpening machine | sharpening machines |
| 1,891,663 | Dec. 20, 1932 | C. Booth | Grinding Machinery | grinding machines |
| 1,904,642 | Apr. 18, 1933 | C.G. Hunt | Grinding Machine | grinding machines |
| 1,924,588 | Aug. 29, 1933 | T. Addison | Grinding Machine | grinding machines |
| 1,938,757 | Dec. 12, 1933 | F.S. Haas, S. Einstein | Grinding Machine | grinding machines |
| 1,972,316 | Sep. 04, 1934 | C.H. Randolph | Process of and apparatus for grinding internal surfaces of tubes | |
| 1,985,237 | Dec. 25, 1934 | C. Booth | Grinding Machine | grinding machines |
| 1,991,799 | Feb. 19, 1935 | C. Booth, S. Einstein | Grinding Machine | grinding machines |
