Acoustic imaging apparatus

Acoustic logging using ultrasonic frequencies

Acoustic method and apparatus for determining effectiveness of m

Acoustic velocity logging system

Acoustic well logging with threshold adjustment

Acoustical switch

Animal attraction method and apparatus

Apparatus for and methods of seismic prospecting

Apparatus for obtaining seismic data

Apparatus for preventing cycle skipping in processing acoustic w

Automatic data acquisition method and system

Automatic gain control for seismometer recorders

Bidirectional seismic array and method of seismic exploration

Broadband electroacoustic converter

Circumferential acoustical detector

Color display of geophysical and other data

Combination flyer-jumper and method of manufacture of same in wh

Combination flyer-jumper associated with a geophysical data acqu

Combined pipeline marker and test unit

Continuous bit positioning system