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| Patents for David D. Erwin | |||||
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| Number | Date | Patentee | Title | Type | |
| 141,736 | Aug. 12, 1873 | E. Tarrant | Improvement in log-turners | sawmill log handling | |
| 145,031 | Nov. 25, 1873 | J. Torrent | Improvement in saw-mill dogs | sawmill dogs | |
| RE9,291 | Jul. 13, 1880 | J. Torrent | Log-turner | sawmill accessories | |