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| Patents for John Williamson | |||||
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| Number | Date | Patentee | Title | Type | |
| 172,679 | Jan. 25, 1876 | S. Williamson | Metal Turning Lathe | metal lathes | |
| 328,270 | Oct. 13, 1885 | J. Williamson | Pipe Wrench and Cutter | pipe wrenches | |