COMMUNICATIONS EQUIPMENT, NAMELY, COMMUNICATION SYSTEMS HAVING RADIOS, DESK CONSOLES, INTERFACES, WIRELESS UNITS, MASTER CONTROLS AND PARTS THEREOF FOR USE WHERE ENERGY TRANSMISSION IS LIMITED BY NATURAL AND/OR MAN-MADE BARRIERS SUCH AS ROCKS AND/OR STEEL REINFORCED WALLS AND/OR WHERE THE TRANSMISSION ENERGY IS LIMITED BY SAFETY CONSIDERATIONS SUCH AS IGNITION AVOIDANCE OF METHANE IN COAL MINES

'and/or':27,35,39 'avoid':52 'barrier':31 'coal':56 'communic':1,4 'consider':48 'consol':9 'control':14 'desk':8 'energi':21,43 'equip':2 'ignit':51 'interfac':10 'limit':24,45 'made':30 'man':29 'man-mad':28 'master':13 'methan':54 'mine':57 'name':3 'natur':26 'part':16 'radio':7 'reinforc':37 'rock':34 'safeti':47 'steel':36 'system':5 'thereof':17 'transmiss':22,42 'unit':12 'use':19 'wall':38 'wireless':11

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