Deep and/or shallow electrical resistivity investigation suitabl

Deep investigation induction logging with mirror image coil arra

Deep penetration well logging sonde

Deep penetration well logging system and method

Deep penetration well logging system and method using secondary

Deep underground imaging utilizing resistivity...

Detectable transponder reel housing

Detecting buried pipeline depth and location with electromagneti

Detecting field distortion in underground line location

Detecting underground objects

Detection element for objects and detection device using the...

Detection of borehole currents due to a decentered...

Detection of ground-laid wire using ultraviolet C-band...

Detection of influx of fluids invading a borehole

Detection of subsurface resistivity contrasts with...

Detector apparatus and method

Detector for detecting a buried current carrying conductor

Detector for detecting a buried current carrying conductor...

Detector for detecting a buried current carrying conductor...

Detector for non-ferrous metals with reduced false positive...