Dimensions of the mine are smaller than indicated above are almost difficult and their work will require a longer period for penetration. Good dimensions in the sense of convenience in the work of work are mines of 1.5 x 1.5 m dimensions.
Dimensions of the mine are smaller than indicated above are almost difficult and their work will require a longer period for penetration. Good dimensions in the sense of convenience in the work of work are mines of 1.5 x 1.5 m dimensions.
