| All Patents in class 408/232 |
Patents 1 -
13
of 13
      |
| Number | Date | Patentee | Title | Type |
| 40,203 | Oct. 06, 1863 | C.C. Walworth | Screw Cutting Tap | taps and dies |
| 40,386 | Oct. 20, 1863 | C.C. Walworth | Screw Cutting Tap | taps and dies |
| 91,201 | Jun. 15, 1869 | W. Barry | Pipe Tool | pipe deburring tools |
| 95,379 | Sep. 28, 1869 | T.M. Richardson | Auger with Detachable Tip | auger bits |
| 104,404 | Jun. 21, 1870 | A.L. Andrews | Improvement in Auger Bits | auger bits |
| 208,087 | Sep. 17, 1878 | W. Haney | Auger Bit with Detachable Tip | auger bits |
| 253,523 | Feb. 14, 1882 | L.R. Faught | Boring-bar | drilling and boring |
| 524,952 | Aug. 21, 1894 | E.C. Phillips | Bit With Replaceable Wood-Screw Lead | drill bits |
| 529,832 | Nov. 27, 1894 | E.C. Phillips | Bit With Replaceable Wood-Screw Lead | drill bits |
| 548,385 | Oct. 22, 1895 | F.W. Nelson | Auger Bit with Detachable Tip | auger bits |
| 958,112 | May 17, 1910 | H.B. Maschmeier, T.S. Halliwell | Boring-Tool | hollow bits |
| 1,924,887 | Aug. 29, 1933 | O. Severson | Inserted Cutting Blade Lock | milling machine cutters |
| 3,195,376 | Jul. 20, 1965 | W. Bader | Boring Head | boring heads |
