| All Patents in class 175/394 |
Patents 1 -
9
of 9
      |
| Number | Date | Patentee | Title | Type |
| 91,387 | Jun. 15, 1869 | A. Vaughan | Improved post auger | |
| 629,539 | Jul. 25, 1899 | J. Bertram | Boring and excavating implement | |
| 880,140 | Feb. 25, 1908 | B. Hastings | Drilling Machine | stone boring and drilling machines |
| 2,349,033 | May 16, 1944 | N.R. Elliott | Boring Head | pipe and orifice cleaners |
| 2,673,714 | Mar. 30, 1954 | J.M. Hargrave | Rock or masonry drill | drill bits |
| 2,863,640 | Dec. 09, 1958 | G.A. Petersen | Offset Boring Head for Auger | well digging or drilling tools |
| 2,919,902 | Jan. 05, 1960 | M.J. Steffes | Masonry drill | |
| 2,969,122 | Jan. 24, 1961 | M.J. Steffes | Masonry drill | |
| 4,595,322 | Jun. 17, 1986 | B. Clement | Spade drill bit | drill bits |
