| All Patents in class 451/222 |
Patents 1 -
10
of 26
      |
| Picture | Number | Date | Patentee | Title |
 | 99,970 | Feb. 15, 1870 | J. Swan | Machine for Grinding & Polishing Bits |
 | 187,770 | Feb. 27, 1877 | C.D. Owen, executor, J.R. Brown (deceased), estate of, L. Sharpe, executor | Grinding Machine |
 | 303,239 | Aug. 05, 1884 | J. Swan | Mechanism for Manufacturing Augers |
| | 407,721 | Jul. 23, 1889 | J.D. Cox, Jr. | Machine for back-clearing twist-drills |
 | 1,238,934 | Sep. 04, 1917 | C.G. Olson | Lathe |
| | 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 |
| | 1,835,687 | Dec. 08, 1931 | H.M. Allison | Backing-Off Mechanism for Grinding Machines |
| | 1,854,184 | Apr. 19, 1932 | R.E. Flanders | Means for Correctly Setting Relieved Taps in Thread-Finishing Machines |
