Section 16 Machinery and mechanical appliances; electrical equipment; parts thereof; sound recorders and reproducers, television image and sound recorders and reproducers, and parts and accessories of such articles 84 Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof 84 04 Auxiliary plant for use with boilers of heading 84.02 or 84.03 (for example, economisers, super-heaters, soot removers, gas recoverers); condensers for steam or other vapour power units. 84 04 10 Auxiliary plant for use with boilers of heading no. 84.02 or 84.03 Commodity Code Description 84 04 10 00 Auxiliary plant for use with boilers of heading no. 84.02 or 84.03