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A mixture of coal dust in air reduces explosive limit our methane
A mixture of coal dust in air reduces the explosive limit of methane
One and one half to two percent methane together with coal dust in air may be explosive
One and one half to two percent methane together in air with coal dust my be explosive
Mine below the water table tend to have more methane then those above water table
Mines below water table tend to have more methane then those above the water table
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