Harmonized System
Section XXI > Chapter 97 > Heading 9704
Postage or revenue stamps, stamp-postmarks, first-day covers, postal stationery (stamped paper), and the like, used or unused, other than those of heading 49.07.
Section XVI > Chapter 85 > Heading 8518
Microphones and stands therefor; loudspeakers, whether or not mounted in their enclosures; headphones and earphones, whether or not combined with a microphone, and sets consisting of a microphone and one or more loudspeakers; audio-frequency electric amplifiers; electric sound amplifier sets.
Section XVI > Chapter 85 > Heading 8518 > 8518.2
Loudspeakers, whether or not mounted in their enclosures
Section XVI > Chapter 85 > Heading 8518 > 8518.10
Microphones and stands therefor
Section XVI > Chapter 85 > Heading 8518 > 8518.2 > 8518.21
Single loudspeakers, mounted in their enclosures
Section XVI > Chapter 85 > Heading 8518 > 8518.2 > 8518.22
Multiple loudspeakers, mounted in the same enclosure
Section XVI > Chapter 85 > Heading 8518 > 8518.30
Headphones and earphones, whether or not combined with a microphone, and sets consisting of a microphone and one or more loudspeakers