21. Freezing process of shaft sinking introduced by
22. The stowing pipes in pneumatic stowing made of
23. In which line of extraction one solid stook intervenes between two stooks under extraction at a time.
24. OMS achieved by B. G method is more than . . . . . . . .
25. Crane or grab used for clearing the debris upto a depth of . . . . . . . .
26. Gallery in the process of being driven
27. The extended portionof gate roads in L/W called
28. The bord and pillar method adopted of the coal scam is thicker than . . . . . . . .
29. The life of the M. S pipe used in sand stowing in lac ton of sand.
30. Without derrick holes can be drilled depth of
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