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| All Patents in class 251/262 | |||||
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| Number | Date | Patentee | Title | Type | |
| 10,398 | Jan. 03, 1854 | W. Wright | Operating Cut-Off Valves of Steam Engines | steam engine valves | |
| 2,782,802 | Feb. 26, 1957 | B. Sassen | Hydraulic Control System | hydraulic apparatus | |