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| All Patents in class 439/500 | |||||
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| Number | Date | Patentee | Title | Type | |
| 6,139,359 | Oct. 31, 2000 | J.A. Pierman, D.A. Nowak, R.L. Hartman, J.M. Beer, J.E. Fuhreck | Cordless Screwdriver and Multi-Position Battery Pack Therefor | screwdrivers | |