Power operated rotary earth boring drill bits featuring tungsten carbide insert cutting elements, tungsten carbide and hardmetal/hard material wear protection, and using open, air-cooled or sealed, roller-or-friction-type bearing systems

'air':25 'air-cool':24 'bear':34 'bit':7 'bore':5 'carbid':10,15 'cool':26 'cut':12 'drill':6 'earth':4 'element':13 'featur':8 'friction':32 'hardmetal/hard':17 'insert':11 'materi':18 'open':23 'oper':2 'power':1 'protect':20 'roller':30 'roller-or-friction-typ':29 'rotari':3 'seal':28 'system':35 'tungsten':9,14 'type':33 'use':22 'wear':19

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