A shrinkage method combining with medium-length hole and shallow hole

hole by hole blasting

hole by hole blasting technique

hole by hole detonating

hole by hole initiating

hole by hole initiation

Hole-by-hole

mid-and-deep hole combining shallow hole balsting

sight hole peep hole

accordion pocket

air pocket

air vesicle pocket

air-pocket

ash pocket

Bark pocket

bellows pocket

box pleated pocket

breast pocket

Brunton pocket compass