| All Patents in class 451/421 |
Patents 1 -
10
of 17
      |
| Picture | Number | Date | Patentee | Title |
 | 75,411 | Mar. 10, 1868 | J. Grant | Improvement in grinder for knives for planers |
 | 129,548 | Jul. 16, 1872 | J.J. Grant | Improvement in devices for grinding rotary cutters |
 | 161,726 | Apr. 06, 1875 | G.E. Woodbury | Improvement in planing-machines |
 | 267,579 | Nov. 14, 1882 | M.W. Palmer | Planer-knife grinder |
 | 856,726 | Jun. 11, 1907 | H.B. Ross | Cutter-head-knife sharpener |
| | 983,850 | Feb. 07, 1911 | L.B. Whipple | Knife-grinding attachment for planing-machines |
 | 990,373 | Apr. 25, 1911 | H.J. Mitchell | Planer-knife sharpener |
 | 1,038,500 | Sep. 10, 1912 | J.F. Tracy, H.B. Foley | Portable grinding device for sharpening knives of jointing or planing machines |
 | 1,160,784 | Nov. 16, 1915 | F. Stutzman | Grinding-machine |
 | 1,438,991 | Dec. 19, 1922 | W.R. Fox, H.D. Corwin | Pipe cutter |
