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| All Patents in class 209/138 | |||||
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| Number | Date | Patentee | Title | Type | |
| 9,693X | Jun. 02, 1836 | R. Engle | Smut machine | miller | |
| 1,080,066 | Dec. 02, 1913 | H.L. Johnston | Refining-machine for coffee and the like | coffee cleaners | |