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| Patents Granted on 1851-10-21 | |||||
| Number | Date | Patentee | Title | Type | |
| 8,456 | Oct. 21, 1851 | T.J. Sloan | Making Screws | material cutting machines | |
| 8,457 | Oct. 21, 1851 | G.C. Taft | Box opener | box openers | |