Apparatus for wireless transmission of acoustic information; Digital audio players; Earphones and headphones; Electrical plugs and sockets; Integrated chip (IC) voice recorders; Loud speakers; Printed circuit boards; Recording and playing devices for sound and image carriers; Recording devices for sound and image carriers; Sound recording apparatus

'acoust':6 'apparatus':1,46 'audio':9 'board':27 'carrier':36,43 'chip':19 'circuit':26 'devic':31,38 'digit':8 'earphon':11 'electr':14 'headphon':13 'ic':20 'imag':35,42 'inform':7 'integr':18 'loud':23 'play':30 'player':10 'plug':15 'print':25 'record':22,28,37,45 'socket':17 'sound':33,40,44 'speaker':24 'transmiss':4 'voic':21 'wireless':3

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