71.
What shall be the minimum distance between the detaching hook & the detaching plate where a geared engine is used and the cage is at its normal position at the top of the shaft?

79.
It stone drift, after shots have been fired, all loose rock shall be removed from the face, area lying within a distance of . . . . . . . . m from the face shall be thoroughly cleaned or washed down and carefully examined for presence of sockets.

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