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| All Patents in class 81/DIG8 | |||||
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| Number | Date | Patentee | Title | Type | |
| 55,100 | May 29, 1866 | J. Hegarty | Nut Wrench | basin wrenches | |
| 597,101 | Jan. 11, 1898 | F.O. Collings | Wrench | quick adjust wrenches | |
| 820,185 | May 08, 1906 | J.W. Edmands | Tool | wrench sockets | |
| 923,420 | Jun. 01, 1909 | C.E. Drake | Wrench | alligator wrenches | |
| 1,578,331 | Mar. 30, 1926 | R.D. Litwiller | Thrashing Machine Cylinder Wrench | cylinder tooth wrenches | |
| 2,578,687 | Dec. 18, 1951 | H.L. Fish | Split Ratchet Socket Wrench | ratchet wrenches | |