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| Patents for Robert McCormick Jr. | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,500X | Apr. 20, 1831 | R. McCormick, Jr. | Grist mill, self stopper | grist mills | |
| 6,504X | Apr. 21, 1831 | R. McCormick, Jr. | Art of teaching violin | ||