Surface drilling machine must be standard.Before breaking ground, make sure that the correct position, Yes.While drilling would require protective material, fallen in the ground floor.
Drilling equipment must be standardized before drilling be sure to use the correct position during drilling would have fallen in the lower line of defense material.
The drill floor to standards before the drill floor have to make sure it's correct position ขณะทำการ drill must have the resistant material falling on the ground floor.