| All Patents in class 408/181 |
Patents 1 -
15
of 38
      |
| Number | Date | Patentee | Title | Type |
| 18,003 | Aug. 11, 1857 | A. Weeks | Expanding auger-bit | adjustable drill bits |
| 64,581 | May 07, 1867 | J.G. Schmidt | Improvement in machines for cutting bungs | bung making machines |
| 123,201 | Jan. 30, 1872 | G. Schloemer | Improvement in machines for making barrel-heads | barrel making machines |
| 144,583 | Nov. 11, 1873 | J. Wheelock | Improvement in Tool-Holders and Cutter-Heads for Boring-Bars | portable metal boring and drilling machines |
| 164,953 | Jun. 29, 1875 | F. Willig | Improvement in Expansible Bits | adjustable drill bits |
| 255,846 | Apr. 04, 1882 | L.R. Faught | Boring-bar | drilling and boring |
| 260,497 | Jul. 04, 1882 | W.L. Parmelee | Improvements in Expansion-Bits | adjustable drill bits |
| 296,242 | Apr. 01, 1884 | W. Steers | Extension-bit | auger bits |
| 430,358 | Jun. 17, 1890 | R. Burns, H. Westbrook | Screw Cutting Device | taps and dies |
| 442,828 | Dec. 16, 1890 | C.P. Russell | Screw-cutting die | taps and dies |
| 572,099 | Dec. 01, 1896 | G. Bettcher | Safety Socket for Taps or Drills | tap and die holders |
| 594,615 | Nov. 30, 1897 | B.H. Fowle | Expansive Bit | adjustable drill bits |
| 719,089 | Jan. 27, 1903 | F.W. Conant | Screw Plate and Die | drill accessories |
| 807,956 | Dec. 19, 1905 | W.B. McElney | Extension-bit | auger bits |
| 950,782 | Mar. 01, 1910 | A.B. Jennings | Expansible bit | auger bits |
