Digital audio paging and control systems comprised of electrical controllers for public address announcement systems, message communication servers, peripheral interface devices for computers, downloadable computer software and firmware for controlling and operating digital audio paging and control systems, microphones, audio amplifiers, audio speakers, and AV equipment storage racks sold as a unit of digital audio paging and control systems

'address':13 'amplifi':41 'announc':14 'audio':2,34,40,42,55 'av':45 'communic':17 'compris':7 'comput':23,25 'control':5,10,30,37,58 'devic':21 'digit':1,33,54 'download':24 'electr':9 'equip':46 'firmwar':28 'interfac':20 'messag':16 'microphon':39 'oper':32 'page':3,35,56 'peripher':19 'public':12 'rack':48 'server':18 'softwar':26 'sold':49 'speaker':43 'storag':47 'system':6,15,38,59 'unit':52

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