With drilling not very solid rocks, simple tickling chisels are used; for more solid breeds — bite and zeta; For hard fissured, the cross -bit are consumed, and if passable hard rocks are intended to be overlap with pipes, the diameter of the couplings of which is more than the length of the loan blade, then the drilling is made with an extensor, which is turned on, as already indicated, between the chisel and the shock bar.
And if passable hard
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