Acoustic transmitter

Acoustic well logging methods and apparatus

Acoustical logging apparatus having signal delay means

Acoustical sparker probe apparatus

Acoustical well logging method and apparatus

Acquisition method and device for seismic exploration of a...

Actuator for an air gun having a reciprocating shuttle valve

Advanced downhole periodic seismic generator

Advanced motor driven clamped borehole seismic receiver

Air cushion shear wave vibrator

Air gun fire time sensor

Air gun firing control

Air gun firing sensor apparatus and system

Air gun monitoring and synchronizing method and apparatus

Air gun monitoring method and apparatus

Air gun utilizing magnetized shuttle

Air gun with reciprocating shuttle

Air release control in seismic energy source air gun

Air release in seismic source air gun

Air transportable seismic exploration system for use on ice-cove