| All Patents in class 175/384 |
Patents 1 -
8
of 8
      |
| Number | Date | Patentee | Title | Type |
| 111,099 | Jan. 17, 1871 | B. Walch | Adjustable Spur Auger | adjustable drill bits |
| 112,063 | Feb. 21, 1871 | J.C. Mills | Improvement in Auger-Bits | adjustable drill bits |
| 155,333 | Sep. 22, 1874 | W.L. Parmelee | Improvement in expansion-bits | adjustable drill bits |
| 432,705 | Jul. 22, 1890 | A.V. Hartle | Earth Auger | augers |
| 627,659 | Jun. 27, 1899 | F.B. Spry | Expanding Auger | auger bits |
| 873,093 | Dec. 10, 1907 | H.B. Ross | Cutter-head for grooving and jointing machines | cutterheads |
| 1,048,792 | Dec. 31, 1912 | J.G. Baker | Boring, Turning and Planing Tool | wood drilling and boring |
| 3,664,755 | May 23, 1972 | L.J. Caras | Finishing Boring Head | boring heads |
