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| US4944101 | 11 Ago 1989 | 31 Jul 1990 | | Apparatus and method for recovering materials from fluid bodies |
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| US6883535 | 14 Jun 2002 | 26 Abr 2005 | Unified Solutions Inc. | Liquid handling apparatus |
| US6926026 | 8 Oct 2003 | 9 Ago 2005 | | Siphon initiating device |
