BLADE TYPE DRILLING BITS COMPRISING A SERIES OF STEPS WHICH ARE TIPPED WITH WEAR-RESISTANT CUTTING ELEMENTS OF NATURAL AND/OR SYNTHETIC DIAMOND INCLUDING POLY- CRYSTALLINE SUPERABRASIVE COMPOSITE MATERIALS AND COMBINATIONS THEREOF, FOR USE IN ROTARY AND TURBINE DRILLING SOFT THROUGH HARD FOUNDATIONS

'and/or':21 'bit':4 'blade':1 'combin':31 'composit':28 'compris':5 'crystallin':26 'cut':17 'diamond':23 'drill':3,39 'element':18 'foundat':43 'hard':42 'includ':24 'materi':29 'natur':20 'poli':25 'resist':16 'rotari':36 'seri':7 'soft':40 'step':9 'superabras':27 'synthet':22 'thereof':32 'tip':12 'turbin':38 'type':2 'use':34 'wear':15 'wear-resist':14

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