135207 ⎘
Drill bits; Roller bits with longitudinal axis, e.g. wobbling or nutating roller bit
Earth-boring drill bits with controlled cutter speed across the bit face, and related methods
#2Drill bits with anti-tracking features
#3BALANCING OF DRILL BITS
#4Drilling apparatus and method
#5Drill bits with anti-tracking features
#6Device for drilling a bore in the ground
#7Enhanced Drill Bit Lubrication Apparatus and Method
#8Enhanced drill bit lubrication apparatus and method
#9Device for advancing drillings in the ground
#10Roller bit with a journal pin offset from the central axis thereof