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| Patents for Earl L. Karstaedt | |||||
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| Number | Date | Patentee | Title | Type | |
| 993,366 | May 30, 1911 | W. Harper, F.W. Converse | Planer-knife sharpener | woodworking machine sharpening mechanisms | |
| 993,367 | May 30, 1911 | W. Harper | Planer-knife jointer | woodworking machine sharpening mechanisms | |