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| All Patents in class 122/389 | |||||
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| Number | Date | Patentee | Title | Type | |
| 23,320 | Mar. 22, 1859 | A.M. Sprague | Apparatus for Skimming of the Water in Steam-Boilers | stationary boilers | |
| 154,734 | Sep. 01, 1874 | R. Waugh | Surface Blow-Offs | steam blow offs | |