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| All Patents in class 137/181 | |||||
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| Number | Date | Patentee | Title | Type | |
| 143,761 | Oct. 21, 1873 | J.W. Hodges | Steam-Traps | steam and water separators | |
| 1,302,948 | May 06, 1919 | C.R. Meston | Valve for refrigerating-systems | ||