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 57 Machining centres, unit construction machines (single station) and multi-station transfer machines, for working metal. 84 57 20 Unit contruction machines (single station) 84 57 20 00 Unit contruction machines (single station) Commodity Code Description 84 57 20 00 000 Unit contruction machines (single station)