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7

Steel, light metal, container and pipeline construction

Steam boiler, container and piping construction

Boiler house components and heaters

1223.11

Boiler house components

1223.19

Steam jet heating apparatus

1223.20

Steam injectors

1223.21

Economisers

1223.24

Process media heaters

1223.27

Air heaters

1223.33

Combined flue and smoke-tube heaters