81. Ropes for winding and haulage purpose have a central core of . . . . . . . .
82. The cutting unit of continuous miner consisting of the cutter head laced with carbide tipped picks and driven by a water cooled . . . . . . . . kw motor through spur gear.
83. The borer type of continuous miner gives . . . . . . . . rate of advance.
84. High standard of track maintainance required for hauling the tubs at . . . . . . . .
85. The back stay arrest the running of tubs in . . . . . . . . direction.
86. The size of galleries required for employing model 625 Auger drill . . . . . . . .
87. AM 50 normally operated by with . . . . . . . . stage conveyor following the . . . . . . . . strand chain conveyor.
88. If the wires in the strand are laid in the same direction as the strands are laid in the rope called . . . . . . . .
89. The branch road devioting at angle of not more than . . . . . . . . off the main road for employing direct rope haulage.
90. The cage chains and D links made of . . . . . . . .
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