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| All Patents in class 408/55 | |||||
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| Number | Date | Patentee | Title | Type | |
| 535,747 | Mar. 12, 1895 | G.T. Whitney | Boring Machine | wood drilling and boring | |
| 2,701,482 | Feb. 08, 1955 | G.L. Otto | Milling and center-drilling machine | milling machines | |