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| Patents for Geo. A. Hoffman | |||||
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| Number | Date | Patentee | Title | Type | |
| 583,741 | Jun. 01, 1897 | K. Gerhardt | Wrench | self-adjust wrenches | |
| 918,050 | Apr. 13, 1909 | R.H. Hazeltine | Valve Grinding Device | valve grinding tools | |