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