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| Patents for E. R. Harper | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 497,754 | May 16, 1893 | W. Lewis | Planing Machine for Metal | |
 | 541,620 | Jun. 25, 1895 | S.L. Kneass | Injector | |
 | 646,397 | Mar. 27, 1900 | W.H. Thorne, J.S. Bancroft | Grinding-Machine | |