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| All Patents in class 192/84.6 | |||||
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| Number | Date | Patentee | Title | Type | |
| 614,190 | Nov. 15, 1898 | O.S. Walker | Magnetic chuck | magnetic chucks | |
| 1,853,864 | Apr. 12, 1932 | F.S. Kingston | Clutch and motor construction | electric motors | |
| 1,953,179 | Apr. 03, 1934 | F.S. Kingston | Clutch | industrial machine clutches | |