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| Patents for William H. Wilhelm | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 222,901 | Dec. 23, 1879 | H.C. Heckendorn | Improvement in oval-lathes | |
 | 233,753 | Oct. 26, 1880 | H.C. Heckendorn | Lathe for turning ovals | |