Acoustic transducer

Acoustic well logging methods and apparatus

Acoustical logging apparatus having signal delay means

Acoustical sparker probe apparatus

Acoustical well logging method and apparatus

Advanced downhole periodic seismic generator

Advanced motor driven clamped borehole seismic receiver

Anti-bounce device for a mass striking a target element

Anti-bounce device for a mass striking a target element

Anti-bounce device for preventing the multiple shocks of a movin

Apparatus and method for attenuating tube waves in a borehole

Apparatus and method for determining the quality of clamping of

Apparatus and method for generating a seismic source signal

Apparatus and method for generating a seismic source signal

Apparatus and method for investigating wellbores and the like

Apparatus for attenuating Stoneley waves in a borehole

Apparatus for generating multiple seismic signals in a wellbore

Apparatus for generating P waves and S waves

Apparatus for generating seismic vibration energy in a borehole

Apparatus for generating seismic waves