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| Patents for David Dunham | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,155X | Jun. 28, 1814 | D. Dunham | Machinery for horse boats | boats and ships | |
| 2,156X | Jun. 28, 1814 | D. Dunham | Machine for horse boats | nautical propulsion apparatus | |