ABSTRACT
The use of back-up detonators increases the probability of detonation if the first detonator fails.
back up equipment, in full face boring the equipment behind the rotational head of the full-face borer.
The use of back-up detonators increases the probability of detonation if the first detonator fails.
back up equipment, in full face boring the equipment behind the rotational head of the full-face borer.