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| Patents for George Zimmer | |||||
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| Number | Date | Patentee | Title | Type | |
| 120,594 | Nov. 07, 1871 | O.J. Pennell, G. Zimmer | Improvement in dovetailing-machines | dovetailing machines | |
| 157,134 | Nov. 24, 1874 | O.J. Pennell, G. Zimmer | Improvement in sash-dovetailing machines | dovetailing machines | |