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| Patents for James F. Duffy | |||||
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| Number | Date | Patentee | Title | Type | |
| D29,984 | Jan. 10, 1899 | J.F. Duffy | Tack Hammer | tack hammers | |
| D33,137 | Aug. 28, 1900 | J.F. Duffy | Design for a Hatchet-Head | axes | |