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| Patents for R. R. Duffie | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 1,050,131 | Jan. 14, 1913 | J.C. Hawes | Convertible Ratchet Wrench | |
 | 1,249,794 | Dec. 11, 1917 | S. McClellan | Ratchet chain breast-drill | |