| All Patents in class 81/57.31 |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 919,156 | Apr. 20, 1909 | C.B. Gilmore | Bit-stock | |
| 1,341,700 | Jun. 01, 1920 | G.D. Alexander | Power-wrench | |
| 1,937,645 | Dec. 05, 1933 | G.O. Leopold, J. Leopold, T.J. Fegley | Push Drill | push drills |
| 2,031,133 | Feb. 18, 1936 | R. Schümann | Electric Hand Tool | handheld grinders |
| 2,320,119 | May 25, 1943 | J.T. Burks | Mechanical wrench | spiral screwdrivers |
| 2,780,944 | Feb. 12, 1957 | E.J. Ondeck | Reversible drive for power tools | handheld power tool accessories |
| 5,269,733 | Dec. 14, 1993 | P.M. Anthony | Power Tool Plastic Gear Train | |
