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| US4606374 | 5 Abr 1983 | 19 Ago 1986 | Nupro Company | Valve | | US4684106 | 3 Mar 1986 | 4 Ago 1987 | Nupro Company | Valve | | US5964446 | 19 Ago 1997 | 12 Oct 1999 | Fisher Controls International, Inc. | Elastomeric element valve | | US6102071 | 7 Abr 1999 | 15 Ago 2000 | Fisher Controls International, Inc. | Elastomeric element valve |
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