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| US5143524 | 20 Feb 1990 | 1 Sep 1992 | The Scott Fetzer Company | Electrostatic particle filtration | | US5376168 | 5 Jun 1992 | 27 Dic 1994 | The L. D. Kichler Co. | Electrostatic particle filtration | | US5405434 | 22 Sep 1993 | 11 Abr 1995 | The Scott Fetzer Company | Electrostatic particle filtration |
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