| All Patents in class 408/213 |
Patents 1 -
15
of 81
      |
| Number | Date | Patentee | Title | Type |
| 6,428X | Mar. 21, 1831 | G. Shetter | Wood auger | auger bits |
| 12,318 | Jan. 30, 1855 | R. Jennings | Auger | auger bits |
| 17,038 | Apr. 14, 1857 | A. Hall | Expansive bit | adjustable drill bits |
| 20,192 | May 11, 1858 | W.A. Clark | Method of seating the movable cutter in expansive bits | adjustable drill bits |
| 21,160 | Aug. 10, 1858 | W. Tucker | Variable-Boring Bit | adjustable drill bits |
| 21,179 | Aug. 17, 1858 | C.L. Barnes | Bit with Detachable Cutter | drill bits |
| 22,195 | Nov. 30, 1858 | M. Norris | Auger for wood | adjustable drill bits |
| RE2,081 | Oct. 03, 1865 | R. Jennings | Improvement in Augers | auger bits |
| 50,887 | Nov. 07, 1865 | H.T. Love | Improvement in augers | auger bits |
| RE2,146 | Jan. 16, 1866 | R. Jennings | Improvement in Augers | auger bits |
| 72,065 | Dec. 10, 1867 | J.A. McGee | Improvement in Augers | auger bits |
| 75,454 | Mar. 10, 1868 | I.T. Payne | Improvement in augers | auger bits |
| 87,796 | Mar. 16, 1869 | H.L. Shailer | Double-twist auger | drill bits |
| 90,755 | Jun. 01, 1869 | W.A. Ives | Improvement in Auger-Bits | auger bits |
| 90,759 | Jun. 01, 1869 | H.C. Lewis | Single Twist Auger Bit | auger bits |
