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To make the roof stitching technique effective it is recommended that
'B'a'c'k'w'a'r'd' 'r'u'n'a'w'a'y' 'o'f' 't'u'b's' 'p'r'e'v'e'n't'e'd' 'b'y' 'm'e'a'n's' 'o'f' '.' '.' '.' '.' '.' '.' '.' '.'
CMRS designed hydraulic Prop. Have
The flame safety lamp commonly used for accumulation test made under velox trade names . . . . . . . .
In deep mines 1000 - 1500 m deep the air pressure is about . . . . . . . .% more than at surface.