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| Patents for Gardner B. Chapin | |||||
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| Number | Date | Patentee | Title | Type | |
| 161,995 | Apr. 13, 1875 | D.L. Toppan | Improvement in planing-machines | wood planers | |
| 163,342 | May 18, 1875 | D.L. Toppan | Improvement in drill for drilling metal | eggbeater drills | |