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| All Patents in class 192/99B | |||||
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| Number | Date | Patentee | Title | Type | |
| 448,777 | Mar. 24, 1891 | G.W. Drake | Friction Clutch | friction clutches | |
| 521,059 | Jun. 05, 1894 | T.J. Thorp | Clutch | industrial machine clutches | |