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| Patents for D. D. Roper | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 141,975 | Aug. 19, 1873 | A. Xander | Improvement in sawing-machines | |
 | 147,066 | Feb. 03, 1874 | T.W. Parry | Improvement in machines for dressing slate-frames | |