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| All Patents in class 122/209.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 215,798 | May 27, 1879 | G.H. Corliss | Tubular Steam-Boiler | stationary boilers | |
| 696,240 | Mar. 25, 1902 | C. Holly | Steam Boiler | stationary boilers | |