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| All Patents in class 81/331 | |||||
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| Number | Date | Patentee | Title | Type | |
| 587,974 | Aug. 10, 1897 | J.E. Colton, E.L. Keith | Lock Jaw Wrench | quick adjust wrenches | |
| 619,546 | Feb. 14, 1899 | J.K. Daniels | Monkey Wrench | quick adjust wrenches | |
| 858,618 | Jul. 02, 1907 | N. McAslan | Compound Tool | pliers | |
| 1,086,078 | Feb. 03, 1914 | H.R. Palmer | Plier Wrench | pliers | |
| 1,294,689 | Feb. 18, 1919 | O.H. Mellum | Combination Pliers and Wrench | pliers type wrenches | |
| 1,488,759 | Apr. 01, 1924 | E.M. Loftus | Pliers and Wrench | pliers | |