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 73 8469.00.00 TO 84.72. 84 73 21 PARTS & ACC. OF ELEC. CAL.MACH.OF SUB-HD 8470.10.00/8470.21.00/8470.29.00. Commodity Code Description 84 73 21 00 PARTS & ACC. OF ELEC. CAL.MACH.OF SUB-HD 8470.10.00/8470.21.00/8470.29.00.