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| All Patents in class 192/52.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 893,684 | Jul. 21, 1908 | A.W. Whitcomb | Power Transmitting Device | friction clutches | |
| 1,210,257 | Dec. 26, 1916 | B.F. Augustine | Clutch | clutches | |