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| Patents for P. F. Hagle | |||||
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| Number | Date | Patentee | Title | Type | |
| 436,612 | Sep. 16, 1890 | C.H. Newhall | Hammer | nail holding | |
| 638,359 | Dec. 05, 1899 | W.L. Schellenbach | Variable Speed Mechanism | metalworking variable speed mechanisms | |