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| Patents for P. F. Nagel | |||||
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| Number | Date | Patentee | Title | Type | |
| 686,497 | Nov. 12, 1901 | T. Wiedmann | Telescopic Micrometer Gage | inside micrometers | |
| 1,283,740 | Nov. 05, 1918 | C.B. Groff | Drill | ||