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| Patents for William C. Sproul | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,208,852 | Dec. 19, 1916 | W.C. Sproul | Adjusting Cutter | milling machines | |
| 1,499,754 | Jul. 01, 1924 | W.C. Sproul | Milling Machine | milling machines | |