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| Patents for R. G. Dyrenforth | |||||
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| Number | Date | Patentee | Title | Type | |
| 434,004 | Aug. 12, 1890 | S.F. Stever | Wrench | wrenches | |
| 567,966 | Sep. 22, 1896 | D. Drawbaugh | Substance for telephone-electrodes | ||