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| Patents for Max B. A. Doring | |||||
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| Number | Date | Patentee | Title | Type | |
| 892,326 | Jun. 30, 1908 | D. Stewart | Nut and Pipe Wrench | screw adjust wrenches | |
| 892,327 | Jun. 30, 1908 | D. Stewart | Nut and Pipe Wrench | screw adjust wrenches | |