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| All Patents in class 251/237 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,319,964 | May 25, 1943 | F.C. Wilson | Hydraulic press | arbor presses | |
| 2,518,339 | Aug. 08, 1950 | W.S. Landon | Flow Control Means | flow controls | |