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    Percussion pressure Soft rock Hard rock Percussion pressure Hydraulic Drilling method Tophammer DTH COPROD hole diameter, mm 76-127 85-165 105-165 penetration rate 2 1 3 hole straightness 1 3 3 hole depth 1 3 3 production capacity (tons rock/shift) 2 1 3 fuel consumption/drill metre 2 1 2 service life of drillstring 1 2 3 investment in ...

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