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| All Patents in class 209/257 | |||||
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| Number | Date | Patentee | Title | Type | |
| 249,474 | Nov. 15, 1881 | J.C. Parish, A.W. McIntyre | Sawdust-elevator | waste collection mechanisms | |
| 734,214 | Jul. 21, 1903 | C.H. Bidwell | Threshing Machine | threshers and thrashers | |
| 2,256,731 | Sep. 23, 1941 | G.C. Winther | Means for forming and segregating rock chips from aggregates | ||