GEOPHYSICAL INSTRUMENTS AND ACCESSORIES, NAMELY; BOREHOLE LOGGING EQUIPMENT, CONSISTING OF NATURAL GAMMA RADIATION LOGGING INSTRUMENTS; NUCLEAR GAMMA RADIATION LOGGING INSTRUMENTS OF THE GAMMA GAMMA AND NEUTRON NEUTRON VARIETY; ELECTRIC LOGGING INSTRUMENTS WHICH MEASURE SELF POTENTIAL, RESISTIVITY, INDUCED POLARIZATION, AND BOREHOLE FLUID CONDUCTIVITY; SONIC LOGGING INSTRUMENTS; BOREHOLE FLOW METERING INSTRUMENTS; TEMPERATURE MEASURING INSTRUMENTS; HOLE DIRECTION DETERMINATION INSTRUMENTS; VERTICAL SEISMIC PROFILING EQUIPMENT; SURFACE SURVEYING EQUIPMENT, CONSISTING OF NATURAL GAMMA RADIATION SURVEYING INSTRUMENTS; ELECTRICAL SURVEYING INSTRUMENTS WHICH MEASURE SELF POTENTIAL, RESISTIVITY, AND INDUCED POLARIZATION; MAGNETIC SURVEYING INSTRUMENTS; GRAVITY SURVEYING INSTRUMENTS