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| All Patents in class 192/81R | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,105,330 | Jan. 11, 1938 | W.H. Pagenkopf | Tool Holder | metalworking machine tool holders | |
| 3,253,476 | May 31, 1966 | E. Olah | Variable speed drill | handheld power drills | |
| 3,340,975 | Sep. 12, 1967 | F.E. Erickson | Solenoid operated clutch mechanism | machine tool controls | |