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| Patents for David Maxwell | |||||
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| Number | Date | Patentee | Title | Type | |
| 7,785 | Nov. 19, 1850 | J.E. Larkin | Method of Attaching Augers to Their Handles | auger bits | |
| RE203 | Jun. 17, 1851 | E.L. Larkin, J.E. Larkin | Method of Attaching Augers to Their Handles | auger bits | |