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| Patents for Duane J. Kelsey | |||||
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| Number | Date | Patentee | Title | Type | |
| 433,084 | Jul. 29, 1890 | D.J. Kelsey | Protractor | protractors | |
| 670,677 | Mar. 26, 1901 | D.J. Kelsey | Draftsman's Protractor | protractors | |