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| All Patents in class 192/52.6 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,049,957 | Jan. 07, 1913 | A.W. Whitcomb | Friction Clutch | friction clutches | |
| 1,987,194 | Jan. 08, 1935 | F.S. Kingston | Clutch | industrial machine clutches | |