| All Patents in class 451/331 |
Patents 1 -
15
of 36
      |
| Number | Date | Patentee | Title | Type |
| 24,196 | May 31, 1859 | W. Clemson | Machine for Grinding Saws | making sawblades |
| 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 | grinding machines |
| 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 |
| 483,288 | Sep. 27, 1892 | A.B. Landis | Grinding-machine | grinders |
| 672,511 | Apr. 23, 1901 | J.M. Nash | Abrading-machine | sanding machines |
| 704,348 | Jul. 08, 1902 | J.N. Lapointe | Grinding-machine | drill sharpening machines |
| 734,897 | Jul. 28, 1903 | A.B. Landis | Automatic grinding-machine | grinders |
| 957,935 | May 17, 1910 | C.M. Conradson | Grinding Machine Feeding Mechanism | grinding machines |
| 1,548,563 | Aug. 04, 1925 | H.K. Spencer | Means For Handling Articles | grinding attachments |
| 1,707,708 | Apr. 02, 1929 | J.E. Caster | Process for the Production of Spherical Articles | grinding machines |
| 1,733,863 | Oct. 29, 1929 | J.E. Caster | Centerless Grinding | grinding machines |
| 1,814,279 | Jul. 14, 1931 | G.W. Binns | Hopper Feed | grinding machines |
| 1,837,821 | Dec. 22, 1931 | H.W. Holmes | Centerless Grinding Machine | grinding machines |
