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| All Patents in class 470/68 | |||||
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| Number | Date | Patentee | Title | Type | |
| 9,688 | Apr. 26, 1853 | T.J. Sloan | Machine for pointing and threading screw-blanks | ||
| 304,945 | Sep. 09, 1884 | E.J. Manville | Screw Threading Machine | metal threading machines | |