Optimized earth boring seal means
Particle-matrix composite drill bits with hardfacing
PCD face seal for earth-boring bit
PCD face seal for earth-boring bit
PCD face seal for earth-boring bit
Polycrystalline diamond carbide composites
Polycrystalline diamond constructions having improved...
Polycrystalline diamond insert, drill bit including same,...
Polycrystalline diamond with improved abrasion resistance
Prevention of cone seal failures in rock bits
Protected cutter mounting for drill bits
Protector for rock bit seals
Radial force anti-extrusion device for sealed drill string unit
Raise bit with cutters stepped in a spiral and flywheel
Raise boring head having fluid traversing means
Raise drill bit inboard cutter assembly
Raise drill having water passages directed toward the roller cut
Raise drill with removable stem
Raise drill with replaceable stem
Reamer bit for raise boring