Percussion drill head
Pilot tube system and attachment mechanism for auger boring...
Process and tool for laying underground collector mains for liqu
Process for establishing a clear horizontal borehole in a subter
Process for recovering methane gas from subterranean coalseams
Remote control for a drilling machine
Removable boring head with tapered shank connector
Rock boring process and apparatus
Rotary drill guard assembly and method
Rotary driven pipe-bursting tool
Shallow depth, coiled tubing horizontal drilling system
Side hole drilling in boreholes
Subterranean boring machine
Two-pipe on-grade directional boring tool and method
Underbalanced well drilling and production