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| Patents for Manning Merrill | |||||
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| Number | Date | Patentee | Title | Type | |
| 125,386 | Apr. 09, 1872 | T. Gaillard | Improvement in Drop Presses | drop hammers | |
| 459,607 | Sep. 15, 1891 | R.L. Barclay | Drop Hammer | drop hammers | |
| 799,352 | Sep. 12, 1905 | M. Merrill | Drop Hammer | drop hammers | |