| All Patents in class 451/220 |
Patents 1 -
10
of 19
      |
| Picture | Number | Date | Patentee | Title |
 | 197,711 | Nov. 27, 1877 | E.J. Worcester | Improvement in machines for grinding lawn-motor cutter |
| | 230,715 | Aug. 03, 1880 | I.L. Penney | Grinding Twist Drills |
 | 324,669 | Aug. 18, 1885 | O.C. Donecker | Wood-fluting mechanism |
 | 407,577 | Jul. 23, 1889 | J.D. Cox, Jr. | Machine for back-clearing twist-drills |
| | 418,977 | Jan. 07, 1890 | C.E. Forry | Machine for Grinding Lawn Mower Knives |
| | 626,436 | Jun. 06, 1899 | E. Mills | Grinding Machine |
| | 636,540 | Nov. 07, 1899 | S.E. Louden | Device for Holding Lawn Mower Cutters for Sharpening |
| | 709,178 | Sep. 16, 1902 | S.C. Schofield | Tool Holder and Guide for Grindstones |
 | 1,075,285 | Oct. 07, 1913 | A.L. De Leeuw | Cutter Setting Dial |
| | 1,274,502 | Aug. 06, 1918 | O.S. Bickford | Machine for Flutiing Twist Drill Blanks |
