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| US4580657 | 16 Jun 1983 | 8 Abr 1986 | Donaldson Company, Inc. | Integral fluted tube for sound suppression and exhaust ejection | | US4632216 | 27 Jun 1984 | 30 Dic 1986 | Donaldson Company, Inc. | Muffler apparatus and method for making same | | US5123501 | 21 Oct 1988 | 23 Jun 1992 | Donaldson Company, Inc. | In-line constricted sound-attenuating system |
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