| All Patents in class 408/232 |
Patents 1 -
10
of 13
      |
| Picture | Number | Date | Patentee | Title |
| | 40,203 | Oct. 06, 1863 | C.C. Walworth | Screw Cutting Tap |
| | 40,386 | Oct. 20, 1863 | C.C. Walworth | Screw Cutting Tap |
| | 91,201 | Jun. 15, 1869 | W. Barry | Pipe Tool |
 | 95,379 | Sep. 28, 1869 | T.M. Richardson | Auger with Detachable Tip |
 | 104,404 | Jun. 21, 1870 | A.L. Andrews | Improvement in Auger Bits |
 | 208,087 | Sep. 17, 1878 | W. Haney | Auger Bit with Detachable Tip |
 | 253,523 | Feb. 14, 1882 | L.R. Faught | Boring-bar |
 | 524,952 | Aug. 21, 1894 | E.C. Phillips | Bit With Replaceable Wood-Screw Lead |
 | 529,832 | Nov. 27, 1894 | E.C. Phillips | Bit With Replaceable Wood-Screw Lead |
 | 548,385 | Oct. 22, 1895 | F.W. Nelson | Auger Bit with Detachable Tip |
