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| All Patents in class 81/DIG3 | |||||
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| Number | Date | Patentee | Title | Type | |
| 167,717 | Sep. 14, 1875 | R.J. Welles | Improvement in Monkey-Wrenches | screw adjust wrenches | |
| 476,767 | Jun. 07, 1892 | A.K. Lovell | Wrench | quick adjust wrenches | |
| 1,132,252 | Mar. 16, 1915 | C.G. Fruedinger | Combination Tool | ||
| 1,218,316 | Mar. 06, 1917 | M.A. Rice | Wrench | wrench adjustment locks | |
| 1,362,014 | Dec. 14, 1920 | G.C. Lawson | Pipe Wrench | pipe wrenches | |
| 1,378,209 | May 17, 1921 | J.E. Bergman | Wrench | nut wrenches | |
| 1,729,640 | Oct. 01, 1929 | C. Vallone | Wrench | wrench adjustment locks | |