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| All Patents in class 192/56.41 | |||||
| Number | Date | Patentee | Title | Type | |
| 2,073,967 | Mar. 16, 1937 | A. Kiefer | Bolt turning machine and the like | ||
| 2,699,856 | Jan. 18, 1955 | W.L. McCann | Overload release clutch | metalworking power transmission | |