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| All Patents in class 210/262 | |||||
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| Number | Date | Patentee | Title | Type | |
| 274,048 | Mar. 13, 1883 | E.R. Stilwell | Feed-water heater and purifier | feedwater apparatus | |
| 3,456,797 | Jul. 22, 1969 | M. Roger | Apparatus and method for cleaning dirty liquid | ||