Wireless electronic devices for locating and tracking equipment and personnel in underground mines; Computer hardware and recorded software systems for tracking of equipment and personnel location, proximity detection, atmospheric gas monitoring, and emergency text and voice communication and for communicating in the field of underground mining; Electronic devices for locating and tracking equipment and personnel in underground mines and monitoring carbon monoxide (CO), oxygen (O2), and methane concentration, and airflow using wired and wireless nodes positioned in the underground mine for receiving transmissions from tags, text pagers and CO sensors and relaying information to a server

'airflow':70 'atmospher':29 'carbon':61 'co':63,89 'communic':37,40 'comput':14 'concentr':68 'detect':28 'devic':3,48 'electron':2,47 'emerg':33 'equip':8,23,53 'field':43 'gas':30 'hardwar':15 'inform':93 'locat':5,26,50 'methan':67 'mine':13,46,58,80 'monitor':31,60 'monoxid':62 'node':75 'o2':65 'oxygen':64 'pager':87 'personnel':10,25,55 'posit':76 'proxim':27 'receiv':82 'record':17 'relay':92 'sensor':90 'server':96 'softwar':18 'system':19 'tag':85 'text':34,86 'track':7,21,52 'transmiss':83 'underground':12,45,57,79 'use':71 'voic':36 'wire':72 'wireless':1,74

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