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| All Patents in class 408/231 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,655,964 | Oct. 20, 1953 | J.A. Labbee, Jr. | Screw Mate | drill bits | |
| 5,904,452 | May 18, 1999 | D. Kress | Chip Removing Precision Finishing Tool | insert tool holders | |