Before revision: Procedure A drill jumbo during the construction of Citybanan under Stockholm, used for drilling holes for explosives As the name suggests, drilling and blasting works as follows: A number of holes are drilled into the rock, which are then filled with explosives.
After revision: partiallyProcedure A drill jumbo during the construction of Citybanan under Stockholm, used for drilling holes for explosives As the name suggests, drilling and blasting works as follows: A number of holes are drilled into the rock, which are then filled with explosives.