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| All Patents in class 122/318 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 53,617 | Apr. 03, 1866 | B. Holly | Steam Boiler Water Tube | |
 | 166,398 | Aug. 03, 1875 | G.T. McLaughlin | Improvement in steam-generators | |
 | 742,480 | Oct. 27, 1903 | E.I. Nichols | Steam-generator | |
 | 1,698,563 | Jan. 08, 1929 | D.W. Robb | Boiler | |