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| All Patents in class 33/676 | |||||
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| Number | Date | Patentee | Title | Type | |
| 82,131 | Sep. 15, 1868 | E.E. Lazell | Centering Device | center punches | |
| 464,619 | Dec. 08, 1891 | G. Wyatt | Centering Tool | center marking gauges | |
| 1,000,659 | Aug. 15, 1911 | W.D. Adams | Marking and Spacing Device | marking gauges | |