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| All Patents in class 210/535 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,908 | Jan. 10, 1843 | H.R. Dunham | Cocks, stop, for hydrants | hydrants | |
| 453,105 | May 26, 1891 | E. Bretney | Water-purifier | ||
| 2,049,498 | Aug. 04, 1936 | F. Hardinge | Oil purifying system | industrial furnaces | |