Mass on target percussion device for generating seismic waves

Mass positioning adjustment mechanism for a seismic sensor

Mass positioning apparatus for a seismic sensor

Matching p wave and shear wave sections in seismic exploration

Materials and construction for a tamper indicating radio...

Means and method for controlling the neutron output of a...

Means and method for transmitting a high count rate pulse...

Means for flexibly guiding the travel of an upwardly...

Means for isolating rotational vibration

Means for marine seismic exploration and method of operating...

Means for metallic object detection

Measurement and control of the output force of a seismic...

Measurement of electrical air-earth current

Measurement of flowing water salinity within or behind...

Measurement of formation gas pressure in cased wellbores...

Measurement of formation porosity using fast neutron...

Measurement of gamma-ray energy due to inelastic neutron...

Measurement of gamma-ray energy due to thermal neutron...

Measurement of hydraulic conductivity using a radioactive or...

Measurement of nonlinear formation parameters using sonic...