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| All Patents in class 192/94 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,425,213 | Aug. 08, 1922 | C.A. Palmgren | Drill chuck | drill chucks | |
| 1,904,563 | Apr. 18, 1933 | R.W. Strout | Positive-action clutch | industrial machine clutches | |
| 3,454,143 | Jul. 08, 1969 | H.L. Beam, W.A. Berube, G.A. Dobslaw | Power-operated tool | handheld power drills | |