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| Patents for James Duckworth | |||||
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| Number | Date | Patentee | Title | Type | |
| 268,560 | Dec. 05, 1882 | J. Duckworth, E. Smith | Combination Tool | bevels | |
| 282,966 | Aug. 14, 1883 | E. Smith, J. Duckworth | Combined Protractor, Square, and Bevel | bevels | |