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| All Patents in class 192/66.21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 393,682 | Nov. 27, 1888 | M.F. Williams | Clutch-pulley | industrial machine pulleys and belt drive mechanisms | |
| 1,930,319 | Oct. 10, 1933 | W.F. Ocenasek | Friction clutch | woodworking power transmission | |
| 2,228,622 | Jan. 14, 1941 | G.W. Emrick | Clutch mechanism | tapping heads and chucks | |