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| All Patents in class 92/20 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,393,918 | Jan. 29, 1946 | R.H. McClellan, C.E. Linden | Hydraulic operating and control mechanism | |
| 3,003,472 | Oct. 10, 1961 | D.C. Miller, R.M. Ferris | Quill Actuating and Clamping Mechanism | ||