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| Patents for Royall S. Hildreth | |||||
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| Number | Date | Patentee | Title | Type | |
| 99,317 | Feb. 01, 1870 | R.S. Hildreth | Improvement in bit-stocks | brace chucks | |
| 108,784 | Nov. 01, 1870 | R.S. Hildreth | Improvement in Vises | ||