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| Patents for R. M. Clough | |||||
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| Number | Date | Patentee | Title | Type | |
| 490,638 | Jan. 31, 1893 | R.M. Clough | Duplex Gear Cutter | gear cutting tools | |
| 1,191,282 | Jul. 18, 1916 | R.M. Clough | Angle Iron Cutter | metal shearing machines | |