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The height of bench is decided by

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Which crusher is to be recommended for use where the crusher gap is more important than the capacity? In every coal seam arrangements shall be made once in at least every . . . . . . . . days to ascertain the atmospheric condition behind the stoppings built to seal of the area of workings, unless such stopings are capable of resisting force of an explosion. Jack hammer drill used for vertically downward drilling upto a depth of . . . . . . . . m. A company producing bearing plates for rock bolts has the selling price Rs. 20/unit and the variable cost has Rs. 12/unit. If the total fixed cost is Rs. 5,60,000, then the break even output units of bearing plates is Which equipment is essential for cable bolting in underground mines?