| All Patents in class 451/20 |
Patents 1 -
11
of 11
      |
| Number | Date | Patentee | Title | Type |
| 591,357 | Oct. 05, 1897 | C.H. Norton | Micrometer Feed for Grinding or Other Machines | metalworking machine mechanisms |
| 732,184 | Jun. 30, 1903 | B.M. Hanson | Dimensioning apparatus | measuring tools |
| 782,220 | Feb. 14, 1905 | S.E. Laws, Administratrix, A.D. Laws, deceased (Estate of), J. Coulter | Automatic Screw Cutting and Turning Lathe | screwcutting lathes |
| 956,208 | Apr. 26, 1910 | E.F. Smith | Grinding-machine | surface grinders |
| 1,016,585 | Feb. 06, 1912 | P.A. Solem | Grinding-machines | sharpening machines |
| 1,106,574 | Aug. 11, 1914 | B.E. Marshall | Lifting and stopping device | sharpening machines |
| 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 | grinding machines |
| 1,718,554 | Jun. 25, 1929 | J. Greensmith | Hydraulic Grinder | surface grinders |
| 1,874,583 | Aug. 30, 1932 | L.F. Nenninger | Grinding Machinery | grinding machines |
| 1,928,162 | Sep. 26, 1933 | H.H. Asbridge | Precision grinding or abrading machine | grinding machines |
