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| All Patents in class 408/220 | |||||
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| Number | Date | Patentee | Title | Type | |
| 129,376 | Jul. 16, 1872 | W. Tucker | Improvement in Screw Taps | taps and dies | |
| 574,721 | Jan. 05, 1897 | C. Elterich | Thread Cutting Implement | taps and dies | |