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| All Patents in class 279/102 | |||||
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| Number | Date | Patentee | Title | Type | |
| 5,881,614 | Mar. 16, 1999 | H. Cheng-Tsan | Tool with reversible bit and method of assembly | screwdrivers | |
| 5,971,681 | Oct. 26, 1999 | I.E. Wolfe, R.J. Schroeder | Drawbar guide ring with drive keys | milling machine accessories | |