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| Patents for A. V. De Witt | |||||
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| Number | Date | Patentee | Title | Type | |
| 12,437 | Feb. 27, 1855 | W.B. Emery | Method of adjusting cylinders in boring-machines | drilling and boring | |
| RE2,229 | Apr. 17, 1866 | J.M. Horton | Improvement in Attaching Augers to their Handles | auger handles | |