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| Patents for E. C. Duffy | |||||
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| Number | Date | Patentee | Title | Type | |
| 435,789 | Sep. 02, 1890 | T.W. Bartholomew | Handle for Coffin Planes | plane handles | |
| 451,833 | May 05, 1891 | J. Mueller | Improved Spanner | quick adjust wrenches | |
| 620,143 | Feb. 28, 1899 | C. Johnson | Wrench | ratchet wrenches | |
| 723,848 | Mar. 31, 1903 | H. Dreihaus | Tool Holder | combination tools | |
| 1,057,110 | Mar. 25, 1913 | N. Armstrong | Pipe Wrench | pipe wrenches | |