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| All Patents in class 209/733 | |||||
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| Number | Date | Patentee | Title | Type | |
| 453,105 | May 26, 1891 | E. Bretney | Water-purifier | ||
| 3,489,286 | Jan. 13, 1970 | M.R. Estabrook | Hydrocyclone separator with particle trap | separators | |