51. Broken tools removed from drill hole by
52. The type of feed mechanism used for shallow drilling
53. Main objectives of directional drilling
54. Hole made by rotating helical screw blade called
55. Deflection techniques are usually adopted in
56. The type of shaft sinking employed in any fissured water bearing strata except running sand
57. In, development mine, at any place with a cover not less than
58. Indian coal is characterised by
59. Shuttle cars are the transporting media for
60. Wire line drilling technique reduces the
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