| All Patents in class 451/380 |
Patents 16 -
30
of 34
      |
| Number | Date | Patentee | Title | Type |
| 946,635 | Jan. 18, 1910 | F. Franke | Machine for grinding straight machine-knives | cutter grinding |
| 981,810 | Jan. 17, 1911 | D.I. Sterling | Grindstone Attachment | grinding attachments |
| 987,589 | Mar. 21, 1911 | E.S. Mummert | Grinding Machine for Sharpening Edged Tools | sharpening machines |
| 1,016,585 | Feb. 06, 1912 | P.A. Solem | Grinding-machines | sharpening machines |
| 1,047,424 | Dec. 17, 1912 | T. Lumsden | Tool Holder for Tool and Like Grinding Machines | sharpening tool holders |
| 1,077,306 | Nov. 04, 1913 | P.H. Root | Grinding Machine | sharpeners |
| 1,133,651 | Mar. 30, 1915 | T. Lumsden | Tool Holder for Tool Grinding Machines | sharpening tool holders |
| 1,185,219 | May 30, 1916 | T. Lumsden | Tool Holder for Grinding Machines | sharpening tool holders |
| 1,214,241 | Jan. 30, 1917 | V.M. Tuthill | Universal knife-holding bar | woodworking machine sharpening mechanisms |
| 1,221,556 | Apr. 03, 1917 | L.P. McEachron | Tool Holder | sharpening tool holders |
| 1,385,519 | Jul. 26, 1921 | L.F. Calhoun | Cutting Tool Holder | sharpening tool holders |
| 1,402,001 | Jan. 03, 1922 | W.H. Mensching | Tool Holder | tool holders |
| 1,659,257 | Feb. 14, 1928 | F. Giampeter | Tool Holder | sharpening tool holders |
| 2,069,097 | Jan. 26, 1937 | P.H. Root | Knife grinder | sharpening machines |
| 2,467,674 | Apr. 19, 1949 | E.C. Krueger | Tool grinder | |
