Tube amplifiers; [ USB card readers; ] Digital to analogue converters;Sound recording apparatus; Matrix switchers for audio and video signals; Consumer electronic products, namely, audio amplifiers, audio speakers, audio receivers, electrical audio and speaker cables and connectors, audio decoders, video decoders, speakers, power conversion devices, power converters, and power inverters

'amplifi':2,25 'analogu':8 'apparatus':12 'audio':16,24,26,28,31,37 'cabl':34 'card':4 'connector':36 'consum':20 'convers':43 'convert':9,46 'decod':38,40 'devic':44 'digit':6 'electr':30 'electron':21 'invert':49 'matrix':13 'name':23 'power':42,45,48 'product':22 'reader':5 'receiv':29 'record':11 'signal':19 'sound':10 'speaker':27,33,41 'switcher':14 'tube':1 'usb':3 'video':18,39

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