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| All Patents in class 192/32 | |||||
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| Number | Date | Patentee | Title | Type | |
| 7,557 | Aug. 13, 1850 | N. Barlow | Friction-clutch | industrial machine clutches | |
| 870,206 | Nov. 05, 1907 | V.J. Wahlstrom | Clutch | friction clutches | |