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| Patents for Frederick Pertwee | |||||
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| Number | Date | Patentee | Title | Type | |
| 599,837 | Mar. 01, 1898 | W.G. Harris | Adjustable Spanner or Wrench | screw adjust wrenches | |
| 625,716 | May 23, 1899 | C. Baxter | Spanner | screw adjust wrenches | |