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| Patents for David H. Irland | |||||
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| Number | Date | Patentee | Title | Type | |
| GB-190,306,270 | Jun. 11, 1903 | D.H. Irland | Improvements in Wrenches | pipe wrenches | |
| 732,858 | Jul. 07, 1903 | D.H. Irland | Wrench | pipe wrenches | |
| 739,316 | Sep. 22, 1903 | D.H. Irland | Pipe Wrench | pipe wrenches | |
| 800,850 | Oct. 03, 1905 | F.A. Irland, D.H. Irland | Pipe Wrench | pipe wrenches | |