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| All Patents in class 303/52 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,324,367 | Dec. 09, 1919 | E.W. Zeh | Power-press | screw presses | |
| 2,728,242 | Dec. 27, 1955 | C.B. De Vlieg | Hydraulic control apparatus | hydraulic apparatus | |