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| Patents for C. D. Severance | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,102,581 | Jul. 07, 1914 | O.D. Hapgood | Valve Grinder | valve grinding tools | |
| 1,157,218 | Oct. 19, 1915 | O.D. Hapgood | Breast-drill | breast drills | |