Operating or workingwith CMMs is one of the most hazardous jobs in an underground coal mine. Miners have been fatally struck or pinned by a CMM 39 times since 1984. MSHA has mandated that all CMMs (except full-faced CMMs) be equipped with commercially available proximity detection systems to improve miner safety by preventing the CMM from contacting a miner and also by providing audible and visual warnings to alert the miner when in an unsafe zone.
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