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| Patents for Frank H. Duffy | |||||
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| Picture | Number | Date | Patentee | Title | |
| 187,513 | Feb. 20, 1877 | E.E. Colby | Improvement in bridges | ||
 | 206,067 | Jul. 16, 1878 | R. Allison | Feed Screw and Nut For Rock Drills, etc. | |
 | 226,339 | Apr. 06, 1880 | J. Moffet | Monkey-Wrench | |