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| All Patents in class 74/336R | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,385,283 | Jul. 19, 1921 | E.B. Smith, A.H. Loucks | Lubricator | industrial machine clutches | |
| 2,699,856 | Jan. 18, 1955 | W.L. McCann | Overload release clutch | metalworking power transmission | |
| 3,093,225 | Jun. 11, 1963 | H.R. Uhtenwoldt | Machine Tool Preselect Speed Change Mechanism | metalworking power transmission | |