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| Patents for Dennis Harrigan | |||||
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| Number | Date | Patentee | Title | Type | |
| 69,911 | Oct. 15, 1867 | D. Harrigan | Improvement in Wrenches | angle adjustable wrenches | |
| 114,939 | May 16, 1871 | D. Harrigan | Improvement in Pipe-Cutters | pipe jaw attachments for wrenches | |