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China Railway Group has most patents in tunnel safety monitoring

    Caihong Wen
    By Caihong Wen Replies (1)

    Tunnel safety monitoring helps to rescue people inside a tunnel and to maintain air quality and control spread of smoke in case of fire or a disaster. 

    https://www.mining-technology.com/data-insights/innovators-tunnel-safety-monitoring-mining/?cf-view

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