Reversible air-operated percussive action machine for driving ho
Reversible expander
Reversible penetrating machine with a differential air...
Reversible percussion piston drill apparatus
Reversible, percussive device for ground perforation
Reversing pneumatic percussive device
Rotatable drill pipe having an auger on a free end thereof
Rotating drum variable depth sampler
Rotating push rod boring system
Sampling apparatus and method
Sampling device
Sand control screen and installation method for wells
Sealed core sample barrel
Sediment sampler
Self propelled reversible boring ram
Self-contained excavator and anchor apparatus and method
Self-propelled pneumatic burrowing device
Self-propelled ram boring machine
Self-propelled subsoil penetrating tool system
Self-propelled subsoil penetrating tool system