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23.020 | Fluid storage devices
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23.020.01 | Fluid storage devices in general
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23.020.10 | Stationary containers and tanks
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23.020.20 | Vessels and containers mounted on vehicles
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23.020.30 | Pressure vessels
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23.020.35 | Gas cylinders
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23.020.40 | Cryogenic vessels
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23.020.99 | Other fluid storage devices
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23.040 | Pipeline components and pipelines
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23.040.01 | Pipeline components and pipelines in general
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23.040.03 | Pipelines and its parts for external water conveyance systems
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23.040.05 | Pipelines and its parts for external sewage systems
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23.040.07 | Pipelines and its parts for district heat
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23.040.10 | Iron and steel pipes
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23.040.15 | Non-ferrous metal pipes
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23.040.20 | Plastics pipes
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23.040.40 | Metal fittings
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23.040.45 | Plastics fittings
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23.040.50 | Pipes and fittings of other materials
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23.040.60 | Flanges, couplings and joints
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23.040.70 | Hoses and hose assemblies
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23.040.80 | Seals for pipe and hose assemblies
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23.040.99 | Other pipeline components
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23.060.01 | Valves in general
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23.060.20 | Ball and plug valves
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23.060.40 | Pressure regulators
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23.100 | Fluid power systems
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23.100.01 | Fluid power systems in general
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23.100.10 | Pumps and motors
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23.100.40 | Piping and couplings
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23.100.50 | Control components
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23.100.60 | Filters, seals and contamination of fluids
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23.100.99 | Other fluid power system components
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23.120 | Ventilators. Fans. Air-conditioners
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23.140 | Compressors and pneumatic machines
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23.160 | Vacuum technology
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