71. The rate of loading of gathering arm loaders of used models are . . . . . . . . t/min.
72. Small man clip used in . . . . . . . . haulage.
73. AM 50 mounted on . . . . . . . .
74. If the rope made up of 6 strands, each strand made by 7 wires . . . . . . . .
75. The speed of slow speed plough . . . . . . . . m/min.
76. For remote control the coal drill furnished with iii single pole . . . . . . . . switch.
77. Endless haulage systems are classified into . . . . . . . . types.
78. In shearer machine system, the transporting scheme is with . . . . . . . .
79. Escessive strain of the winding rope is caused by the angle of contact is . . . . . . . . on the pulley.
80. A single central wire called . . . . . . . .
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