public-address systems for use in schools comprised of microphones, logic circuits, amplifiers, audio processors, audio switchers, audio routers, digital audio processors, digital attenuators, microcomputers, and automatic integrity testing equipment; and instructional manuals sold as a unit

'address':3 'amplifi':14 'attenu':25 'audio':15,17,19,22 'automat':28 'circuit':13 'compris':9 'digit':21,24 'equip':31 'instruct':33 'integr':29 'logic':12 'manual':34 'microcomput':26 'microphon':11 'processor':16,23 'public':2 'public-address':1 'router':20 'school':8 'sold':35 'switcher':18 'system':4 'test':30 'unit':38 'use':6

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