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| All Patents in class 192/56.53 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,006,913 | Jul. 02, 1935 | K.H. Conley | Clutch Throwing Mechanism | ||
| 2,886,075 | May 12, 1959 | D.O. Skoog | Torque release clutch drive mechanism for power operated screw drivers and the like | handheld power tools | |