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Roof is easily cavable if proto dyakor index is

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The curvature of diffuser vane shall be so fixed that the fluid enters the guide passage with minimum loss. This is possible only when At every below ground mine where more than A Persons are ordinarily employed belowground and there is no rescue station within its radius of 35 Km, the Owner shall establish a rescue room near the mine entrance. Ais given by Advance supporting of 30 m at both the gate roads is required due to Speed of wireline drilling equipment is How many Co-tubes to be kept at the surface of the mine where no rescue room is located close to the mine entrance?