| All Patents in class 408/144 |
Patents 1 -
10
of 10
      |
| Picture | Number | Date | Patentee | Title |
| | 134,506 | Jan. 07, 1873 | A. Ball | Guides for Rotary Rock Drills |
| | 224,530 | Feb. 17, 1880 | W. Hasenzahl | Boring Tool for Stone Working |
| | 341,938 | May 18, 1886 | C.L. Perkins | Cleaning Tool |
 | 2,029,447 | Feb. 04, 1936 | H.M. Swain | Auger Bit |
| | 2,575,332 | Nov. 20, 1951 | H.D. Cummins | Drill |
 | 2,689,131 | Sep. 14, 1954 | D.E. Priest | Screwdriver with removable blade |
 | 2,794,468 | Jun. 04, 1957 | R.W. Huxtable | Woodcutting bit assembly |
| | 2,934,113 | Apr. 26, 1960 | R.R. Hollien | Router bit and drive shaft assembly with pilot |
 | 3,053,118 | Sep. 11, 1962 | J.A. Lavallee | Method of manufacturing reamers |
| | 3,138,043 | Jun. 23, 1964 | B.R. Greuner | Boring Head |
