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| All Patents in class 209/291 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 8,812X | May 09, 1835 | W.H. King, M.A. Armstrong | Grain cooler and sifter | ||
| 1,037,371 | Sep. 03, 1912 | H. Tscherning | Sand-sifter | ||