Dielectric well logging system with at least three transmitter c

Dielectric well logging system with electrostatically shielded c

Dielectric well logging with radially oriented coils

Digital BFO metal detecting device with improved sensitivity at

Digital induction logging system including means for generating

Digital induction logging tool

Digital induction logging tool including means for compensating

Digital induction logging tool including means for measuring pha

Digital locating system and device for underground object...

Digital locating system and device for underground object...

Digital locating system and device for underground object...

Digital nulling pulse inductive metal detector

Digital two frequency generator for use in borehole heterodyne m

Dipmeter apparatus and method using transducer array having long

Dipole field locate point determination using a horizontal...

Directional antenna system for use in a borehole incorporating a

Directional electromagnetic measurements insensitive to dip...

Directional resistivity measurements for azimuthal proximity...

Discriminating metal detector with compensation for ground miner

Discriminating time domain conducting metal detector utilizing m