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| Patents for Wm. O. Stark | |||||
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| Number | Date | Patentee | Title | Type | |
| 445,020 | Jan. 20, 1891 | E.H. Kinsey | Wrench | pipe wrenches | |
| 448,124 | Mar. 10, 1891 | C.C. Conroy | Improvements in Pipe-Wrenches and Pipe-Tongs | wrench jaw components | |