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| All Patents in class 384/194 | |||||
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| Number | Date | Patentee | Title | Type | |
| 379,690 | Mar. 20, 1888 | G. De Laval | Motor for Operating Centrifugal Separators | rotary steam engines | |
| 686,917 | Nov. 19, 1901 | S.A. Baker | Separating oil from metal cuttings | separators | |