91. Headings advancing in a direction right angles to the main cleat called
92. Brown coal is called
93. Top slicing stoping method belongs to
94. Life of MS pipe used in stowing . . . . . . . . lac ton of sand.
95. In permanent lining, in hard rock the excavation reduced to finished diameter of the shaft and continuous thus for . . . . . . . . below.
96. The diameter of drill hole in shaft sinking
97. The fall which take place after withdrawl of supports
98. 'T' Chisal used in
99. The thrower belt is mounted on . . . . . . . . in mechanical stowing.
100. Rotory method may be used with a view to get
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