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 85 Electrical machinery and equipment and parts thereof; sound recorders and reproducers, television image and sound recorders and reproducers, and parts and accessories of such articles 85 18 Microphones; loudspeakers; headphones...; electric amplifiers... 85 18 40 Audio-frequency electric amplifiers Commodity Code Description 85 18 40 00 Audio-frequency electric amplifiers 85 18 40 20 Used as repeaters in line telephony 85 18 40 30 Used as repeaters in telephony other than line telephony 85 18 40 40 Other, having 6 or more input signal lines, with or without elements for capacity amp 85 18 40 90 Other