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| Patents for J. P. McElroy | |||||
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| Number | Date | Patentee | Title | Type | |
| 136,089 | Feb. 18, 1873 | E.S. Moulton | Pipe-Wrenches | pipe tongs | |
| 145,896 | Dec. 23, 1873 | F.B. Cotton, A.J. Peavey | Devices for Holding and Carrying Pipe-Fittings Chucks | pipe and chain vises | |