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Powered supports, hydraulic chocks or linked bars shall be advanced as soon as practicable after a web of coal has been taken off the face. So as to ensure the area of unsupported newly exposed roof is kept to a . . . . . . . .
Gloves, goggles, skin wards, respirator or such other protective equipment shall be supplied . . . . . . . . to the respective workers working on their respective work.
First indication of roof weighting for regular fracturing roof in goaf.
Most of grain in ignious rock are euhedral. Then the texture is . . . . . . . .
In industrial work study, work sampling is a technique of