91. Knife edge method of mining is
92. Ducting pipes are made of
93. The width of the split gallery should not exceed the width of . . . . . . . . gallery.
94. For ordinary compact and moderately wet strata the perma lining constructed with
95. Mechanical stowing only applicable in
96. The gate roads extend slightly beyond the face the extended portion of gate.
97. Purpose of lead sheeting, for parking
98. When the parting between the seams thicker than . . . . . . . . meters it is not necessary to insist on simultaneous pillar extraction.
99. The finished diameter of shaft varies from
100. The maximum span of L/W face shall not be allowed to exceed.
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