Section 16 MACHINERY AND MECHANICAL APPLIANCES; ELECTRICAL EQUIPMENT; PARTS THERE OF; SOUND RECORDERS AND REPRODUCERS, TELEVISION IMAGE AND SOUND RECORD ERS AND REPRODUCERS, AND PARTS AND ACCESSORIES OF SUCH ARTICLES 84 Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof 84 29 Self-propelled bulldozers, angledozers, graders, levellers, scrapers, mechanical 84 29 51 Used or reconditioned 84 29 51 90 Used or reconditioned Commodity Code Description 84 29 51 90 00 -- Front-end shovel loaders