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| Patents for Conrad D. Volkmann | |||||
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| Number | Date | Patentee | Title | Type | |
| 289,188 | Nov. 27, 1883 | C.D. Volkmann | Pipe Wrench | pipe wrenches | |
| 299,440 | May 27, 1884 | W.D. Peddycord, C.D. Volkmann | Pipe Wrench | pipe wrenches | |