Wireless and wire line access point communication device providing redundant data communication paths from source to destination for two-way in-mine voice and data communications to track, monitor and communicate with miners and equipment underground

'access':5 'communic':7,12,28,33 'data':11,27 'destin':17 'devic':8 'equip':37 'in-min':22 'line':4 'mine':24 'miner':35 'monitor':31 'path':13 'point':6 'provid':9 'redund':10 'sourc':15 'track':30 'two':20 'two-way':19 'underground':38 'voic':25 'way':21 'wire':3 'wireless':1

SUBTERRA-ZAP

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