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| All Patents in class 185/31 | |||||
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| Number | Date | Patentee | Title | Type | |
| 8,726X | Mar. 27, 1835 | E. Whitman | Propelling cradles and churns | churns | |
| 77,462 | May 05, 1868 | A.B. Corby | Improvement in churns | churns | |