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| All Patents in class 251/38 | |||||
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| Number | Date | Patentee | Title | Type | |
| 162,782 | May 04, 1875 | G. Westinghouse, Jr. | Improvement in governors for steam-engines | steam engine governors | |
| 3,102,555 | Sep. 03, 1963 | L.A. Botkin | Floating restrictor for dispensing nozzle | ||