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| Patents for Robert Ashworth | |||||
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| Number | Date | Patentee | Title | Type | |
| CA-62,580 | Feb. 07, 1899 | A.W. Ashworth, R. Ashworth | Wrench | pipe wrenches | |
| 627,466 | Jun. 27, 1899 | A.W. Ashworth, R. Ashworth | Wrench | wrench jaw components | |
| 628,218 | Jul. 04, 1899 | A.W. Ashworth, R. Ashworth | Wrench | pipe wrenches | |
| 771,451 | Oct. 04, 1904 | R. Ashworth | WRENCH | pipe wrenches | |
| CA-91,245 | Jan. 31, 1905 | R. Ashworth | Wrench | pipe wrenches | |