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CMRR - Coal Mine Roof Rating
Software by NIOSH
CMRR (Coal Mine Roof Rating) is software for estimating the relative inherent strength of coal mine roof.
The Coal Mine Roof Rating is a roof classification system that was first introduced to the mining community in 1994. It filled a longstanding need to quantify geologic description of coal measure rocks into an engineering value which could be used for mining design purposes.
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