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| Patents for William S. Allen | |||||
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| Number | Date | Patentee | Title | Type | |
| 442,827 | Dec. 16, 1890 | C.P. Russell | Screw-cutting die | taps and dies | |
| 455,859 | Jul. 14, 1891 | A.J. Smart | Tap Wrench | tap wrenches and die stocks | |