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| Patents for William E. Davidson | |||||
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| Number | Date | Patentee | Title | Type | |
| 376,396 | Jan. 10, 1888 | D.R. Porter | Pipe Wrench | pipe wrenches | |
| CA-30,994 | Mar. 22, 1889 | D.R. Porter | Pipe Wrench | pipe wrenches | |