| All Patents in class 451/372 |
Patents 1 -
15
of 17
      |
| Number | Date | Patentee | Title | Type |
| 62,945 | Mar. 19, 1867 | P.V. Dunn | Improved method of holding edged tools on grindstones | sharpening jigs and fixtures |
| 78,863 | Jun. 16, 1868 | M.C. Cronk | Grinding Harvester Knives | tool grinders |
| 79,030 | Jun. 16, 1868 | J.A. Thompson | Sharpening Mowing-Machine Knives | sharpening machines |
| 87,150 | Feb. 23, 1869 | B.F. Davis | Improvement in Machines for Grinding the Knives of Mowing Machines | tool grinders |
| 193,437 | Jul. 24, 1877 | V.F. Prentice, E.J. Worcester | Improvement in machines for grinding mower and reaper knives | grinders |
| 205,416 | Jun. 25, 1878 | L.D. Dana, F.D. Randall | Improvement in Grinding-Machines | grinders |
| 342,125 | May 18, 1886 | J.C. Neff | Mower and Reaper Knife Grinder | sharpeners |
| 342,290 | May 18, 1886 | R. Dutton | Machine for Grinding Mowing Machine Knives | sharpeners |
| 359,964 | Mar. 22, 1887 | R. Dutton | Machine for grinding mower-knives | sharpeners |
| 567,638 | Sep. 15, 1896 | A.R. Clizbe | Grinding Machine | sharpeners |
| 583,443 | Jun. 01, 1897 | H. Allen | Mowing-machine sharpener | |
| 611,893 | Oct. 04, 1898 | A.R. Clizbe | Grinding Machine | sharpeners |
| 636,192 | Oct. 31, 1899 | H.W. Bolens | Grinding Machine | sharpeners |
| 781,447 | Jan. 31, 1905 | J.W. Myers | Sickle-grinder | sharpening machines |
| 1,163,016 | Dec. 07, 1915 | K.C. Knudson | Tool Holder for Grindstones | sharpening tool holders |
