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| All Patents in class 137/901 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,946,882 | Feb. 13, 1934 | P.S. Russel | Valve | industrial valves | |
| 2,319,964 | May 25, 1943 | F.C. Wilson | Hydraulic press | arbor presses | |