54.
Powered supports, hydraulic chocks or linked bars shall be advanced as soon as practicable after a web of coal has been taken off the face. So as to ensure the area of unsupported newly exposed roof is kept to a . . . . . . . .

56.
In below ground booster or Auxiliary fans is electically driven, installed operated maintained as to prevent open sparking shall not be placed in . . . . . . . . air way.

60.
What is the name of the device used in a shaft exceeding 100 m depth to prevent over speeding & over winding?

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