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| Patents for William D. Washington | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,738 | Sep. 25, 1849 | H. Knowles | Caul for veneers | veneer machines | |
| 6,858 | Nov. 06, 1849 | J.B. Woodruff, B.M. Townsend | File-supporter | saw sharpening machines | |