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| All Patents in class 92/93 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 219,555 | Sep. 09, 1879 | O.C. Woolson | Improvement in hydraulic-power machines | |
| 876,543 | Jan. 14, 1908 | B.M. Hanson | Friction Clutch | ||