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| All Patents in class 192/66.22 | |||||
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| Number | Date | Patentee | Title | Type | |
| 915,298 | Mar. 16, 1909 | W.G. Klemm | Grinding-machine or the like | bench or pedestal grinders | |
| 1,987,194 | Jan. 08, 1935 | F.S. Kingston | Clutch | industrial machine clutches | |
| 2,228,622 | Jan. 14, 1941 | G.W. Emrick | Clutch mechanism | tapping heads and chucks | |