| All Patents in class 451/409 |
Patents 1 -
6
of 6
      |
| Number | Date | Patentee | Title | Type |
| 636,540 | Nov. 07, 1899 | S.E. Louden | Device for Holding Lawn Mower Cutters for Sharpening | metal lathe accessories and attachments |
| 709,178 | Sep. 16, 1902 | S.C. Schofield | Tool Holder and Guide for Grindstones | grinding machines |
| 1,071,634 | Aug. 26, 1913 | A.L. De Leeuw | Tooth Rest | grinding fixtures |
| 2,035,163 | Mar. 24, 1936 | K.W. Holmberg | Tool Holder and Guide | sharpening tool holders |
| 2,725,690 | Dec. 06, 1955 | W.F. French | Cutter grinding mandrel with tooth rest | |
| 2,754,634 | Jul. 17, 1956 | W.F. French | Tooth rests for cutter grinders | cutter grinding |
