64 PRODUCTION, TECHNOLOGY AND RESEARCH | MT 6411 technology and technical regulations | BT1 non-flat product | BT2 materials technology | RT piping [6821]
64 PRODUKTION, TECHNOLOGIE UND FORSCHUNG | MT 6411 Technologie und technische Regelungen | BT1 Runderzeugnis | BT2 Materialtechnologie | RT Rohre [6821]