| All Patents in class 451/20 |
Patents 1 -
10
of 14
      |
| Picture | Number | Date | Patentee | Title |
| | 591,357 | Oct. 05, 1897 | C.H. Norton | Micrometer Feed for Grinding or Other Machines |
 | 732,184 | Jun. 30, 1903 | B.M. Hanson | Dimensioning apparatus |
| | 782,220 | Feb. 14, 1905 | S.E. Laws, Administratrix, A.D. Laws, deceased (Estate of), J. Coulter | Automatic Screw Cutting and Turning Lathe |
 | 956,208 | Apr. 26, 1910 | E.F. Smith | Grinding-machine |
 | 1,016,585 | Feb. 06, 1912 | P.A. Solem | Grinding-machines |
| | 1,106,574 | Aug. 11, 1914 | B.E. Marshall | Lifting and stopping device |
| | 1,261,083 | Apr. 02, 1918 | J.S. Wilcox, Jr. | Wheel Feed for Grinding Machines |
| | 1,662,821 | Mar. 20, 1928 | S. Einstein | Internal Grinder |
| | 1,718,554 | Jun. 25, 1929 | J. Greensmith | Hydraulic Grinder |
| | 1,803,492 | May 05, 1931 | H.E. Townsend | Grinding Machine |
