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| Patents for Prentiss | |||||
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| Number | Date | Patentee | Title | Type | |
| 472,674 | Apr. 12, 1892 | M.G. Lewis | Lewis Tool Co. Model No. 38 | vises | |
| 514,012 | Feb. 06, 1894 | M.G. Lewis | Bench Vise | bench vises | |