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| All Patents in class 192/84.91 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,049,957 | Jan. 07, 1913 | A.W. Whitcomb | Friction Clutch | friction clutches | |
| 1,327,506 | Jan. 06, 1920 | M. Walker | Magnetic clutch | industrial machine clutches | |
| 2,816,454 | Dec. 17, 1957 | A.T. Godschalx, E.E. Hosea | Positioning Means for Machine Tools | metalworking machine mechanisms | |