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| Patents for William P. Letchworth | |||||
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| Number | Date | Patentee | Title | Type | |
| 81,095 | Aug. 18, 1868 | W.P. Letchworth | Improvement in machines for bending wood | wood bending machines | |
| RE3,850 | Feb. 22, 1870 | W.P. Letchworth | Machine for bending wood | wood bending machines | |