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| Patents for William Martin Jr. | |||||
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| Number | Date | Patentee | Title | Type | |
| 5,331 | Oct. 16, 1847 | M. Fisher, W. Martin, Jr. | Improvement in Welding Cast-Iron to Malleable Iron or Steel | blacksmith | |
| 125,642 | Apr. 09, 1872 | C. Whitus | Improvement in bit-braces | braces | |