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
Reamer wing for enlarging a borehole below a smaller-diameter po
Reamer with stabilizers for use in a wellbore
Reamer-stabilizer
Reaming apparatus for well drilling
Reduced erosion nozzle system and method for the use of drill bi
Removable drill bit nozzle
Replaceable bit nozzle
Replaceable multiple TCI kerf ring
Replaceable shirttail
Replaceable wear pad for a rock bit cutter yoke
Resilient, non-rotating seal for rock drill
Ring clamp for a cutter ring in a tunnel drilling machine