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| US4089349 | 4 Nov 1976 | 16 May 1978 | ITW-Ateco G.m.b.H. | Membrane valve | | US4454983 | 4 Feb 1982 | 19 Jun 1984 | | Temperature controlled valve | | US4606374 | 5 Abr 1983 | 19 Ago 1986 | Nupro Company | Valve | | US4684106 | 3 Mar 1986 | 4 Ago 1987 | Nupro Company | Valve | | US6079628 | 5 Feb 1998 | 27 Jun 2000 | | Self-contained temperature and pressure operated pinch valve |
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