Self-lubricating elastomeric seal with polarized graphite
Self-penetrating drilling method and thrust-generating tool...
Shaft drill bit with improved cutter bearing and seal arrangemen
Shaft drill bit with overlapping cutter arrangement
Shale diverting means for a sealed bearing drill bit
Shank structure for rotary drill bits
Shaped inserts with increased retention force
Sharp gage for mill tooth rock bits
Sharp gage for mill tooth rockbits
Shirttails for reducing damaging effects of cuttings
Shirttails for reducing damaging effects of cuttings
Shirttails for reducing damaging effects of cuttings
Single cone earth boring bit
Single cone rock bit having inserts adapted to maintain hole...
Single cone rock bit having inserts adapted to maintain hole...
Single energizer face seal for rocks bits with floating...
Single-cone rock bit having cutting structure adapted to...
Skewed inserts for an earth boring cutter
Small disc cutter, and drill bits, cutterheads, and tunnel borin
Soft formation drill bit