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| Patents for J. C. Simpson | |||||
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| Number | Date | Patentee | Title | Type | |
| 790,084 | May 16, 1905 | M.A. Smith | Wrench | quick adjust wrenches | |
| 850,900 | Apr. 23, 1907 | M. Boynton | Wrench | screw adjust wrenches | |
| 870,886 | Nov. 12, 1907 | E.A. Johnson | Wrench | axle nut wrenches | |
| 894,963 | Aug. 04, 1908 | N.W. Martin | Wrench | quick adjust wrenches | |
| 937,966 | Oct. 26, 1909 | D.W. Shaffer | Wrench | pipe and nut combination wrenches | |
| 1,097,181 | May 19, 1914 | S.T. McLellan | Wrench | quick adjust wrenches | |