| All Patents in class 451/231 |
Patents 1 -
15
of 25
      |
| Number | Date | Patentee | Title | Type |
| 46,152 | Jan. 31, 1865 | D. Slate | Improvement in turning-lathes | metal lathes |
| RE5,236 | Jan. 14, 1873 | P. Schrag, P. Hufeland | Machine for cutting off pencils | pencil making machines |
| RE5,378 | Apr. 29, 1873 | R. Dimes | Processes and Apparatus for Stippling Metallic Surfaces | polishing machines |
| 196,183 | Oct. 16, 1877 | J.A. Bidwell | Die Grinding Machine | die grinding machines |
| 235,352 | Dec. 14, 1880 | J. Franzmann | Machine for shaping wooden shovels | specialty woodworking machines |
| 542,099 | Jul. 02, 1895 | B. Bloomheart, W.F. Nichols | Grinding Apparatus | grinders |
| 648,648 | May 01, 1900 | H. Allen | Mower-knife grinder | |
| 698,315 | Apr. 22, 1902 | E.S. Shimer, H.A. Pardoe | Grinding-machine | cutter grinding machines |
| 876,372 | Jan. 14, 1908 | R.C. Matthews | Surface Grinding Machine | surface grinders |
| 896,357 | Aug. 18, 1908 | R.S. Brown | Machine for Sharpening Cutter Teeth | tool grinders |
| 1,261,669 | Apr. 02, 1918 | W.E. Wright | Sawing Apparatus | |
| 1,395,880 | Nov. 01, 1921 | D.W. Ward | Commutator Brush Reseating Tool | brush reseating tools |
| 1,481,569 | Jan. 22, 1924 | C.E. Tannewitz | Trimming saw | circular crosscut saws |
| 1,483,748 | Feb. 12, 1924 | F.C. Sanford | Grinding Machine | centerless grinders |
| 1,589,043 | Jun. 15, 1926 | W.D. Archea, G.W. Binns | Grinding Machine | cylindrical grinders |
