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