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| All Patents in class 137/512.2 | |||||
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| Number | Date | Patentee | Title | Type | |
| 246,858 | Sep. 13, 1881 | J. Aitchison | Relief Valve for Steam Engines | steam engines | |
| 491,543 | Feb. 14, 1893 | H.F. Frisbie | Valve for Pumps | pump valves | |