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| All Patents in class 209/139.1 | |||||
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| Number | Date | Patentee | Title | Type | |
| 79,791 | Jul. 07, 1868 | R. Ward | Smut Mill | smut mills | |
| 393,411 | Nov. 27, 1888 | P. Sheridan | Grain Separator | corn and grain separators | |
| 1,166,597 | Jan. 04, 1916 | H.L. Johnston | Grinding and refining mill | ||