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| All Patents of Type: purifying oil | |||||
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| Number | Date | Patentee | Title | Type | |
| 255X | Aug. 14, 1799 | R. Robotham | Purifying spermaceti oil | purifying oil | |
| 270X | Feb. 04, 1800 | J.G. Gebhard | Extracting oil from palma christi | purifying oil | |