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| All Patents in class 122/338 | |||||
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| Number | Date | Patentee | Title | Type | |
| 291,185 | Jan. 01, 1884 | H. Hobbs, E.F. Gordon | Steam-generator | steam generators | |
| 408,708 | Aug. 13, 1889 | H. Hobbs, E.F. Gordon | Steam-generator | steam generators | |