Vacuum, vacuum-pressure, or pressure circulation bit having jet-
Vacuum, vacuum-pressure, or pressure reverse circulation bit
Variable diameter earth boring bit
Variable length three-cone rock bit nozzles
Variable orientation nozzles for earth boring drill bits,...
Variable wear pad for crossflow drag bit
Varied pitch rotary rock bit
Vibration and erosion resistant nozzle
Volume and pressure balanced rigid face seal for rock bits
Vortex drill bit