13 ENVIRONMENT. HEALTH PROTECTION. SAFETY 13.060 Water quality 13.060.20 Drinking water 13.060.25 Water for industrial use 23 FLUID SYSTEMS AND COMPONENTS FOR GENERAL USE 23.040 Pipeline components and pipelines 23.040.01 Pipeline components and pipelines in general 23.060 Valves 23.060.01 Valves in general 23.100 Fluid power systems 23.100.40 Piping and couplings 71 CHEMICAL TECHNOLOGY 71.040 Analytical chemistry 71.040.01 Analytical chemistry in general 71.040.10 Chemical laboratories. Laboratory equipment 77 METALLURGY 77.120 Non-ferrous metals 77.120.01 Non-ferrous metals in general 91 CONSTRUCTION MATERIALS AND BUILDING 91.140 Installations in buildings 91.140.70 Sanitary installations |