digital hands-free microphone system, and components therefor, sold individually or as a unit, for use in conjunction with a public announcement system, the system comprising a digital hands-free microphone having the capability of recording messages and playing back messages over the public address system, a digitally-programmable audio amplifier, and, optionally, a remote control microphone on-off switch and volume control

'address':47 'amplifi':54 'announc':23 'audio':53 'back':42 'capabl':36 'compon':8 'compris':27 'conjunct':19 'control':59,67 'digit':1,29,51 'digitally-programm':50 'free':4,32 'hand':3,31 'hands-fre':2,30 'individu':11 'messag':39,43 'microphon':5,33,60 'on-off':61 'option':56 'play':41 'programm':52 'public':22,46 'record':38 'remot':58 'sold':10 'switch':64 'system':6,24,26,48 'therefor':9 'unit':15 'use':17 'volum':66

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