| All Patents in class 451/331 |
Patents 1 -
9
of 9
      |
| Number | Date | Patentee | Title | Type |
| 78,915 | Jun. 16, 1868 | E.C. Atkins | Improvement in machines for polishing metal plates | tool making machines |
| 132,231 | Oct. 15, 1872 | A. Assman | Improvement in Grinding Apparatus | |
| RE5,228 | Jan. 07, 1873 | A. Warth | Machine for cutting lead pencils | pencil making machines |
| 430,398 | Jun. 17, 1890 | J.M. Nash | Machine for smoothing curved surfaces | sanding machines |
| 672,511 | Apr. 23, 1901 | J.M. Nash | Abrading-machine | sanding machines |
| 2,535,439 | Dec. 26, 1950 | J. McEwan | Saw sharpener | saw sharpening machines |
| 2,821,818 | Feb. 04, 1958 | W.S. Swanson, H.E. McGee | Lapping Machine and Automatic Feed Mechanism Therefor | lapping machines |
| 2,835,085 | May 20, 1958 | J.F. Manting | Magnetic dial feeder | |
| 2,958,989 | Nov. 08, 1960 | R.F. Pendergast | Spreading and feeding assembly | sanding machines |
