| All Patents in class 173/216 |
Patents 1 -
7
of 7
      |
| Picture | Number | Date | Patentee | Title |
 | 273,136 | Feb. 27, 1883 | A. Noteman | Portable steam boring-engine |
| | 802,713 | Oct. 24, 1905 | Z. Scott | Auger-brace |
 | 956,822 | May 03, 1910 | M.F. Parsons | Grinding Tool |
 | 2,155,082 | Apr. 18, 1939 | A.G. Decker | Portable electric tool and casing |
 | 2,310,759 | Feb. 09, 1943 | I.C. Clawson | Drill with Adjustable Head |
| | 2,857,793 | Oct. 28, 1958 | L. Pèras | Torque-Limiting Tool Holder for Machine Tools |
| | 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 |
