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| All Patents in class 56/DIG.006 | |||||
| Number | Date | Patentee | Title | Type | |
| 254,283 | Feb. 28, 1882 | L.D. Dana | Friction-clutch | industrial machine clutches | |
| 431,446 | Jul. 01, 1890 | L.D. Dana | Friction-clutch | industrial machine clutches | |