Electronic audio playback units; interchangeable cartridges for electronic audio playback units containing a sound chip with pre-recorded audio programs, namely, fiction and non-fiction audio books; interchangeable cartridges for electronic audio playback units containing a sound chip with pre-recorded audio programs, namely, nonfiction and fiction audio books sold as a unit with printed books

'audio':2,9,20,28,34,45,51 'book':29,52,59 'cartridg':6,31 'chip':15,40 'contain':12,37 'electron':1,8,33 'fiction':23,27,50 'interchang':5,30 'name':22,47 'non':26 'non-fict':25 'nonfict':48 'playback':3,10,35 'pre':18,43 'pre-record':17,42 'print':58 'program':21,46 'record':19,44 'sold':53 'sound':14,39 'unit':4,11,36,56

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