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| All Patents in class 408/227 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,794,468 | Jun. 04, 1957 | R.W. Huxtable | Woodcutting bit assembly | wood drill bits | |
| 6,253,812 | Jul. 03, 2001 | T. Rinehart | Wood Turning Tool | drill bits | |