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| Patents for Charles N. Dunham | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 132,763 | Nov. 05, 1872 | C. Hopkins | Improvement in Watchmakers' Lathes and Chucks | |
| 302,685 | Jul. 29, 1884 | W.P. Dodson | Calipers | ||