earphone, speaker system, headphone receiver, tuner, transistor, phonograph records containing music, mixer, receiver, tape recorder, speaker amplifier, speaker unit, frequency dividers, phonograph microphone, television, HI-FI receivers, radios, wireless equipment, namely, audio earphones, audio headphones, and audio speakers

'amplifi':17 'audio':33,35,38 'contain':10 'divid':21 'earphon':1,34 'equip':31 'fi':27 'frequenc':20 'headphon':4,36 'hi':26 'hi-fi':25 'microphon':23 'mixer':12 'music':11 'name':32 'phonograph':8,22 'radio':29 'receiv':5,13,28 'record':9,15 'speaker':2,16,18,39 'system':3 'tape':14 'televis':24 'transistor':7 'tuner':6 'unit':19 'wireless':30

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