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Subsidence can be controlled by
Protective footwear shall be supplied free of charge at intervals not exceeding . . . . . . . . months.
The laser beam particle size analysis is suitably applicable for particle size measurement of
The percentage of inflammable gas does not exceed . . . . . . . . in the general body of the return air of any ventilating district and . . . . . . . . in any place in the mine.
The failure and the repair rates of a shovel are 0.06 hr-1 and 0.04 hr-1 respectively. The availability of the shovel in percentage is