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