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 83 AND SHAFT COUPLINGS (INCLUDING UNIVERSAL JOINTS). 84 83 90 MILL CHAIN SPROCKETS FOR ROAD MOTOR VEHICLE ENGINES Commodity Code Description 84 83 90 11 MILL CHAIN SPROCKETS FOR ROAD MOTOR VEHICLE ENGINES 84 83 90 19 OTHER TOOTHED WHEELS/CHAIN SPROCKETS/OTH TRANSM. ELEM.... FOR ROAD MOTOR VEH ENGINES 84 83 90 21 MILL CHAIN SPROCKETS FOR MARINE CRAFT 84 83 90 29 OTHER TOOTHED WHEELS/CHAIN SPROCKETS/OTH TRANSM. ELEMENTS....FOR MARINE CRAFT 84 83 90 31 MILL CHAIN SPROCKETS FOR AIRCRAFT ENGINES 84 83 90 39 OTHER TOOTHED WHEELS/CHAIN SPROCKETS/OTH TRANSM. ELEMENTS....FOR AIRCRAFT ENGINES 84 83 90 91 OTHER MILL CHAIN SPROCKETS 84 83 90 99 OTHER TOOTHED WHEELS/CHAIN SPROCKETS/OTH TRANSM. ELEMENTS PRESENTED SEPARATELY; PARTS