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| Patents for Allen H. Gangewer | |||||
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| Number | Date | Patentee | Title | Type | |
| 195,633 | Sep. 25, 1877 | J. Murphin | Improvement in saw-sharpening machines | saw sharpening machines | |
| 198,709 | Dec. 25, 1877 | W.E. Thornton | Pipe-Wrench With Cutter | pipe tongs | |