rock drills for directional drilling; drill bits for directional rock drilling; systems for converting rock drills into directional drills, consisting of complete power hammer with choke, rings and chuck, complete hammer housing, sonde carriage assembly, support station with remote electric valve, hammer oiler, and water injection device; steerable downhole directional rock drills

'assembl':35 'bit':7 'carriag':34 'choke':26 'chuck':29 'complet':22,30 'consist':20 'convert':14 'devic':47 'direct':4,9,18,50 'downhol':49 'drill':2,5,6,11,16,19,52 'electr':40 'hammer':24,31,42 'hous':32 'inject':46 'oiler':43 'power':23 'remot':39 'ring':27 'rock':1,10,15,51 'sond':33 'station':37 'steerabl':48 'support':36 'system':12 'valv':41 'water':45

HARDROCK

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