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| Patents for Frederick L. Woodruff | |||||
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| Picture | Number | Date | Patentee | Title | |
| 409,265 | Aug. 20, 1889 | E.L. Wyckoff, A. Wyckoff | Pipe casing or conduit | ||
| 438,516 | Oct. 14, 1890 | E.L. Wyckoff, A. Wyckoff | Pipe-casing | ||