| All Patents in class 451/141 |
Patents 1 -
9
of 9
      |
| Number | Date | Patentee | Title | Type |
| 492,451 | Feb. 28, 1893 | F.D. Winkley | Grinding apparatus | |
| 513,632 | Jan. 30, 1894 | R. Conrader | Machine for Grinding Spherical or Other Curved Surfaces | grinding machines |
| 956,237 | Apr. 26, 1910 | A.C. Warner | Grinding-machine | sharpening machines |
| 2,002,971 | May 28, 1935 | H.W. Zimmerman | Reamer sharpener | reamers |
| 2,180,911 | Nov. 21, 1939 | B.S. Rogers | Universal lawn mower grinder | sharpening machines |
| 2,990,654 | Jul. 04, 1961 | J. McEwan | Lawn mower sharpening | |
| 3,126,675 | Mar. 31, 1964 | J. McEwan | Lawn mower sharpener | |
| 6,010,394 | Jan. 04, 2000 | J.H. Dieck, R.K. Rosenquist | Automatic mower reel grinder | |
| 6,290,581 | Sep. 18, 2001 | J.H. Dieck, R.K. Rosenquist | Automatic mower reel grinder | |
