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| All Patents in class 81/57.31 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 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 | |
| 2,031,133 | Feb. 18, 1936 | R. Schümann | Electric Hand Tool | ||
| 2,320,119 | May 25, 1943 | J.T. Burks | Mechanical wrench | ||
 | 2,780,944 | Feb. 12, 1957 | E.J. Ondeck | Reversible drive for power tools | |
| 5,269,733 | Dec. 14, 1993 | P.M. Anthony | Power Tool Plastic Gear Train | ||