Device for generating seismic impulses inside a drilling through

Device for generating seismic waves by striking a mass against a

Device for generating sound pulses inside a well, by percussion

Device for producing mechanical waves

Device for propelling a liquid projectile in a liquid medium wit

Device for receiving sound waves in a well

Device for securing two or more seismic energy sources at fixed

Dipole logging tool

Dipole/monopole acoustic transmitter, methods for making and usi

Displacement amplified acoustic transmitter

Disposable point with explosive charge for seismic exploration

Distributed charge for seismic prospecting

Distributed marine seismic source

Distributed seismic energy source

Down hole periodic seismic generator

Down hole seismographic source

Downhole electro-hydraulic vertical shear wave seismic source

Downhole electromagnetic seismic source

Downhole epicyclic motion orbital seismic source

Downhole hydraulic rotary seismic source