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| Patents for Harry A. Ducat | |||||
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| Number | Date | Patentee | Title | Type | |
| 419,046 | Jan. 07, 1890 | G.M. Hinkley | Saw-mill dog | sawmill dogs | |
| 467,007 | Jan. 12, 1892 | G.M. Hinkley | Saw-mill carriage | sawmill carriages | |