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| Patents for D. M. Szymanski | |||||
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| Number | Date | Patentee | Title | Type | |
| 5,090,461 | Feb. 25, 1992 | V.P. Gakhar, J.H. Ballou, J.M. Leubbers, D.M. Szymanski | Router attachment permitting cutting of dentil moulding | handheld routers | |