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| Patents for William W. Duffield | |||||
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| Number | Date | Patentee | Title | Type | |
| 157,989 | Dec. 22, 1874 | W.W. Duffield | Improvement in sawing-machines | reciprocating saws | |
| 407,515 | Jul. 23, 1889 | W.W. Duffield | Draftsman's Protractor | protractors | |