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| Patents for H. C. Warren | |||||
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| Number | Date | Patentee | Title | Type | |
| 82,957 | Oct. 13, 1868 | W.A. Ives | Improvement in hollow augers | hollow bits | |
| 95,803 | Oct. 12, 1869 | W.A. Ives | Improvement in Auger | auger bits | |