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| All Patents in class 56/193 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,157X | Oct. 01, 1830 | T. Preston | Straw cutter | hay or straw cutters | |
| 1,171,003 | Feb. 08, 1916 | A.M. Sosa | Reversing Mechanism for Machine Tools | metalworking speed changing mechanisms | |