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PROCESS FOR MANUFACTURING PRE-MANUFACTURED CONCRETE OR REINFORCED CONCRETE TUBES OF DIFFERENT DIAMETERS AND VARIOUS CROSS-SECTIONS PROVIDED WITH GLASS FIBRE REINFORCED POLYESTHER SHELLING AS WELL AS UTILIZATION OF THESE ELEMENTS IN THE FIELDS OF CONDUIT OR ENGINEERING STRUCTURE BUILDING
PROCESS FOR MANUFACTURING PRE-MANUFACTURED CONCRETE OR REINFORCED CONCRETE TUBES OF DIFFERENT DIAMETERS AND VARIOUS CROSS-SECTIONS PROVIDED WITH GLASS FIBRE REINFORCED POLYESTHER SHELLING AS WELL AS UTILIZATION OF THESE ELEMENTS IN THE FIELDS OF CONDUIT OR ENGINEERING STRUCTURE BUILDING