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| All Patents in class 192/109A | |||||
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| Number | Date | Patentee | Title | Type | |
| 946,155 | Jan. 11, 1910 | W. Runge | Friction-clutch | metalworking power transmission | |
| 1,987,194 | Jan. 08, 1935 | F.S. Kingston | Clutch | industrial machine clutches | |