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| Patents for Ira S. Hamilton | |||||
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| Number | Date | Patentee | Title | Type | |
| 116,955 | Jul. 11, 1871 | I.S. Hamilton | Improvement in ratchet-drills | hand drills | |
| 120,641 | Nov. 07, 1871 | I.S. Hamilton | Improvement in Pipe Wrenches | pipe wrenches | |