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| Patents for William F. Lett | |||||
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| Number | Date | Patentee | Title | Type | |
| 78,336 | May 26, 1868 | A.P. Stephens | Improved composite pipe | ||
| 170,039 | Nov. 16, 1875 | J.E. Williams | Improvement in paper-box machines | cardboard box making machines | |