| All Patents in class 451/406 |
Patents 1 -
15
of 33
      |
| Number | Date | Patentee | Title | Type |
| 81,611 | Sep. 01, 1868 | J.W. Douglas | Grindstone Frame | grinders |
| 98,028 | Dec. 21, 1869 | J. Dickinson, E.D. Dickinson, G.T. Chattaway | Grinding Machine | sharpening machines |
| 105,392 | Jul. 12, 1870 | W.L. Washburn | Grinding Apparatus | grinders |
| 114,098 | Apr. 25, 1871 | S. Bevan | Saw polishing machine | |
| 134,363 | Dec. 31, 1872 | G.L. Cummings | Improvement in grindstone-frames | grindstone frames |
| 261,848 | Aug. 01, 1882 | B.H. Hadley | Emery Grinder | bench or pedestal grinders |
| 403,521 | May 21, 1889 | E. Cutlan | Tool for spiral turning | rope and spiral cutting machines |
| 407,577 | Jul. 23, 1889 | J.D. Cox, Jr. | Machine for back-clearing twist-drills | tool making machines |
| 418,977 | Jan. 07, 1890 | C.E. Forry | Machine for Grinding Lawn Mower Knives | sharpening machines |
| 427,091 | May 06, 1890 | A.B. Landis | Grinding-machine | grinders |
| 477,911 | Jun. 28, 1892 | O.W. Mueller, G.A. Mueller | Grinding Attachment for Lathes | metal lathe accessories and attachments |
| 626,337 | Jun. 06, 1899 | C.H. Norton | Grinding-Machine | cylindrical grinders |
| 629,069 | Jul. 18, 1899 | G.H. Fowler | Mower-knife grinder | sharpeners |
| 654,845 | Jul. 31, 1900 | H.P. Schofield | Saw-support | saw sharpening machines |
| 667,230 | Feb. 05, 1901 | A.B. Landis | Grinding-machine | grinders |
