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| All Patents in class 122/493 | |||||
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| Number | Date | Patentee | Title | Type | |
| 166,398 | Aug. 03, 1875 | G.T. McLaughlin | Improvement in steam-generators | steam generators | |
| 2,160,393 | May 30, 1939 | G.M. Trefts, III | Pressure Vessel of the Boiler Type and Method for Producing Same | stationary boilers | |