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| Patents for O. E. Duffy | |||||
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| Picture | Number | Date | Patentee | Title | |
| 305,206 | Sep. 16, 1884 | C.J. Lowe | Saw | ||
 | 334,670 | Jan. 19, 1886 | W. Kratzer | Anti-friction journal-bearing | |
 | 335,527 | Feb. 02, 1886 | W. Kratzer | Anti-friction journal-bearing | |
 | 336,908 | Mar. 02, 1886 | A.J. Forbes | Railroad Nut Wrench | |
 | 371,476 | Oct. 11, 1887 | G.A. Reese | Lever-Wrench | |