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| Patents for R. P. Duffie | |||||
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| Number | Date | Patentee | Title | Type | |
| 976,131 | Nov. 15, 1910 | S. McClellan | Chain Breast Ratchet Drill | drill accessories | |
| 1,004,173 | Sep. 26, 1911 | J. Kline, J. Joss | Combination Rule, Bevel and Marking Gage | bevel squares | |