Public address and alarm systems and components therefor, namely, amplifiers, printed circuit boards, power supplies, announcing stations, monitor panels, microphone stations, microphones, master station, control center, outlet boxes, jack boxes, talkback boxes, speakers, talkback speakers, explosion proof speakers, trouble indicator and relays

'address':2 'alarm':4 'amplifi':10 'announc':16 'board':13 'box':28,30,32 'center':26 'circuit':12 'compon':7 'control':25 'explos':36 'indic':40 'jack':29 'master':23 'microphon':20,22 'monitor':18 'name':9 'outlet':27 'panel':19 'power':14 'print':11 'proof':37 'public':1 'relay':42 'speaker':33,35,38 'station':17,21,24 'suppli':15 'system':5 'talkback':31,34 'therefor':8 'troubl':39

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