| All Patents in class 451/552 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 97,090 | Nov. 23, 1869 | W.H. Howland | Improvement in knife-sharpener | sharpening apparatus |
| 102,218 | Apr. 26, 1870 | H. Brown | Improvement in oil-stone holders | sharpening jigs and fixtures |
| 664,319 | Dec. 18, 1900 | M.B. Hill | Oil-stone | |
| 985,473 | Feb. 28, 1911 | J.R. Thomas | Blade-truing device | woodworking machine sharpening mechanisms |
| 4,259,815 | Apr. 07, 1981 | W.G. Kuban | Blade sharpener | sharpening apparatus |
| 5,018,315 | May 28, 1991 | L.G. Lee, F.A. McLean, J.H. Gagnon | Apparatus for holding and storing sharpening stones | |
