Audio and visual communication and signaling systems in the nature of master and remote communication and paging control stations comprised of user actuated electrical switches, selector circuits, data control processors, indicator lights, and sound alarms; electrical annunciators; building intercom and internal telephonic communication apparatus comprised of audio speakers, microphones, amplifiers, and intercommunication and selector circuits therefor

'actuat':23 'alarm':35 'amplifi':50 'annunci':37 'apparatus':44 'audio':1,47 'build':38 'circuit':27,55 'communic':4,15,43 'compris':20,45 'control':18,29 'data':28 'electr':24,36 'indic':31 'intercom':39 'intercommun':52 'intern':41 'light':32 'master':12 'microphon':49 'natur':10 'page':17 'processor':30 'remot':14 'selector':26,54 'signal':6 'sound':34 'speaker':48 'station':19 'switch':25 'system':7 'telephon':42 'therefor':56 'user':22 'visual':3

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