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| All Patents in class 210/537 | |||||
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| Number | Date | Patentee | Title | Type | |
| 774,577 | Nov. 08, 1904 | J.C. Gaskill | Oil and Water Separator | separators | |
| 1,400,993 | Dec. 20, 1921 | C.E. Sargent | Boiler Feed Water Purifier | feedwater apparatus | |