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| All Patents in class 81/397 | |||||
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| Number | Date | Patentee | Title | Type | |
| 78,299 | May 26, 1868 | N.F. Loi | Improvement in Pipe-Wrenches | pipe tongs | |
| 150,131 | Apr. 28, 1874 | J.R. Brown | Pipe-Tongs | pipe tongs | |
| 182,492 | Sep. 19, 1876 | H.C. Stouffer | Pipe-Wrench | pipe tongs | |
| 618,313 | Jan. 24, 1899 | A.H. Adams | Pipe and Nut Wrench | pipe tongs | |