| All Patents in class 173/216 |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 273,136 | Feb. 27, 1883 | A. Noteman | Portable steam boring-engine | portable timber borers |
| 802,713 | Oct. 24, 1905 | Z. Scott | Auger-brace | |
| 956,822 | May 03, 1910 | M.F. Parsons | Grinding Tool | valve grinding tools |
| 2,155,082 | Apr. 18, 1939 | A.G. Decker | Portable electric tool and casing | handheld power drills |
| 2,310,759 | Feb. 09, 1943 | I.C. Clawson | Drill with Adjustable Head | eggbeater drills |
| 2,857,793 | Oct. 28, 1958 | L. Pèras | Torque-Limiting Tool Holder for Machine Tools | drilling and boring tool holders |
| 6,199,642 | Mar. 13, 2001 | D.A. Nowak, J.M. Beer, T.P. Becker | Reversible Ratchet Power Tool with Synchronized Motor and Ratchet Control | |
