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| All Patents in class 237/68 | |||||
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| Number | Date | Patentee | Title | Type | |
| 266,462 | Oct. 24, 1882 | H. Hobbs, E.F. Gordon | Vent-valve | steam heating | |
| 587,291 | Jul. 27, 1897 | E.P. Holly | Water Return System for Steam Generators | ||