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| All Patents in class 81/57.34 | |||||
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| Number | Date | Patentee | Title | Type | |
| 421,020 | Feb. 11, 1890 | D.J. Thayer | Wrench For Oil Well Tools | ratchet wrenches | |
| 422,879 | Mar. 04, 1890 | W. Forgie | Improvements In Automatic Wrench for Coupling and Uncoupling the Tools or Drill-Rods of Well-Boring Apparatus | wrenches | |
| 586,527 | Jul. 13, 1897 | L.E. Brackney | Means For Coupling Or UnCoupling Oil-Well Tools | wrenches | |
| 1,629,895 | May 24, 1927 | M.J. Tully | Double Wrench | pipe wrenches | |