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| All Patents in class 122/181 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 53,617 | Apr. 03, 1866 | B. Holly | Steam Boiler Water Tube | |
 | 64,424 | May 07, 1867 | C.H. James | Improvement in tubes for steam generators | |
 | 1,698,563 | Jan. 08, 1929 | D.W. Robb | Boiler | |