audio and visual communication and signalling systems comprised of - master and remote communication and paging control stations consisting of user actuated switches, selector circuits, control processors, indicator lights and sound alarms; annunciators; building intercom and internal telephonic communication apparatus consisting of speakers, microphones, amplifiers, intercommunication and selector circuits therefor

'actuat':21 'alarm':31 'amplifi':44 'annunci':32 'apparatus':39 'audio':1 'build':33 'circuit':24,48 'communic':4,13,38 'compris':8 'consist':18,40 'control':16,25 'indic':27 'intercom':34 'intercommun':45 'intern':36 'light':28 'master':10 'microphon':43 'page':15 'processor':26 'remot':12 'selector':23,47 'signal':6 'sound':30 'speaker':42 'station':17 'switch':22 'system':7 'telephon':37 'therefor':49 'user':20 'visual':3

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