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| Patents for Frederick M. Wirtz | |||||
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| Number | Date | Patentee | Title | Type | |
| 429,553 | Jun. 03, 1890 | F.M. Wirtz, J. Wirtz | Wrench | self-adjust wrenches | |
| 451,792 | May 05, 1891 | J. Wirtz, F.M. Wirtz | Wrench | self-adjust wrenches | |