Apparatus for focusing electrode induced polarization logging

Apparatus for geophysical exploration

Apparatus for imaging objects on the remote side of a...

Apparatus for imparting seismic signals into the earth

Apparatus for interrogating magnetic tags

Apparatus for laying explosive charges for seismic prospecting

Apparatus for locating buried conductors

Apparatus for measuring a gravitational attraction of the earth

Apparatus for measuring formation resistivity through a...

Apparatus for measuring magnetic fields

Apparatus for measuring resistivity of an earth formation...

Apparatus for measuring terrain conductivity

Apparatus for measuring the deformation of periodic signal...

Apparatus for measuring the residual magnetization vector in...

Apparatus for measuring the velocity of mechanical low...

Apparatus for microinductive investigation of earth formations

Apparatus for microinductive investigation of earth formations

Apparatus for nondestructive testing of small blind bores...

Apparatus for obtaining seismic data

Apparatus for obtaining worldwide data on the earth's resonance