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| Patents for C. F. Washburn | |||||
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| Number | Date | Patentee | Title | Type | |
| 145,488 | Dec. 16, 1873 | P.D. Cummings | Grinding Machines | grinders | |
| 160,029 | Feb. 23, 1875 | R.H. Hasty, F.L. Pinney | Improvement in lumber-carriers | sawmill accessories | |