| All Patents in class 451/222 |
Patents 1 -
15
of 26
      |
| Number | Date | Patentee | Title | Type |
| 99,970 | Feb. 15, 1870 | J. Swan | Machine for Grinding & Polishing Bits | making drills and augers |
| 187,770 | Feb. 27, 1877 | L. Sharpe, executor, C.D. Owen, executor, J.R. Brown (deceased), estate of | Grinding Machine | cylindrical grinders |
| 303,239 | Aug. 05, 1884 | J. Swan | Mechanism for Manufacturing Augers | making drills and augers |
| 407,721 | Jul. 23, 1889 | J.D. Cox, Jr. | Machine for back-clearing twist-drills | tool making machines |
| 1,238,934 | Sep. 04, 1917 | C.G. Olson | Lathe | metal lathes |
| 1,259,770 | Mar. 19, 1918 | C.G. Olson | Grinding Machine | |
| 1,275,218 | Aug. 13, 1918 | C.H. Calkins | Machine for Grinding Worm Threads | |
| 1,662,078 | Mar. 13, 1928 | O. Severson | Method of and Machine for Grinding Fine-Tooth Hobs | hob grinding machines |
| 1,835,687 | Dec. 08, 1931 | H.M. Allison | Backing-Off Mechanism for Grinding Machines | grinding attachments |
| 1,854,184 | Apr. 19, 1932 | R.E. Flanders | Means for Correctly Setting Relieved Taps in Thread-Finishing Machines | grinding fixtures |
| 1,975,947 | Oct. 09, 1934 | S. Einstein, H.R. Isler | Machine Tool | tool grinders |
| 1,989,792 | Feb. 05, 1935 | J.C. Drader | Automatic Machine Tool | tool grinders |
| 2,003,263 | May 28, 1935 | H.Q. Munn | Adjustable Work Carrying Table | metalworking machine mechanisms |
| 2,087,662 | Jul. 20, 1937 | R.T. Finn, E.T. Bysshe | Grinding Machine | grinder dressers |
| 2,125,584 | Aug. 02, 1938 | E. Rotzoli | Adjusting Device for Machine Tools | metalworking machines |
