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| All Patents in class 122/297 | |||||
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| Number | Date | Patentee | Title | Type | |
| 861,255 | Jul. 30, 1907 | H.R. Bretney, E. Bretney | Steam-generator | steam generators | |
| 1,839,911 | Jan. 05, 1932 | J.F. Baker | Boiler | stationary boilers | |