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| US4639204 | 12 Jun 1985 | 27 Ene 1987 | C-Tec, Inc. | Apparatus for centrifugally casting concrete panels | | US4729859 | 29 Sep 1986 | 8 Mar 1988 | C-Tec, Inc. | Method for casting concrete panels | | US5306458 | 22 Oct 1992 | 26 Abr 1994 | Hobas Engineering AG | Process for manufacturing a plastic pipe | | US6635213 | 18 Jul 2001 | 21 Oct 2003 | C-Tech Ltd. | Method of producing centrifugally cast, glass fiber reinforced plastic tubes |
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