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

'address':13 'amplifi':39 'announc':9 'audio':2,32,38,40,51 'communic':16,18 'compris':7 'comput':23 'control':5,10,28,35,54 'devic':22 'digit':1,31,50 'equip':43 'firmwar':26 'interfac':21 'messag':15 'microphon':37 'oper':30 'page':3,33,52 'peripher':20 'public':12 'rack':44 'server':17 'softwar':24 'sold':45 'speaker':41 'station':19 'system':6,14,36,55 'unit':48

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