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| All Patents in class 251/359 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,702,550 | Feb. 19, 1929 | F.E. Stevenson | Hydraulic Reducing Valve | hydraulic valves | |
| 1,783,884 | Dec. 02, 1930 | C.C. Lee | Valve-seat liner | valve and seat maintenance | |