7
APPARATUS AND DEVICES FOR THE PRODUCTION OF NATURAL GAS AND CRUDE OIL, NAMELY, MECHANIZED DRILLING AND PRODUCTION RIGS, PRODUCTION CASINGS AND PRODUCTION TREES; POWER-OPERATED MACHINE AND MACHINE TOOL PARTS FOR EARTH DRILLING AND DEEP DRILLING, NAMELY, DRILL BITS, DRILLS, UNDERREAMERS, DEFLECTORS, DOWNHOLE ROTARY DRILLING MOTORS, PACKERS, ARTICULATED DRILL STINGS, NON-MAGNETIC DRILL COLLARS AND PARTS THEREFOR, DOWNHOLE TURBINES AND ELECTRICAL GENERATORS FOR USE IN DIRECTIONAL DRILLING
9
INSTRUMENTS FOR RECORDING AND DIRECTIONAL DRILLING, NAMELY, STEERING APPARATUS, BOREHOLE NAVIGATORS, PROBES, WELLBORE INCLINOMETERS, DATA RECORDERS FOR USE IN WELLS, ELECTRONIC SENSORS AND RECORDERS FOR RECORDING GAMMA-RAY ACTIVITY, ELECTRONIC UNITS WHICH MEASURE INCLINATION AND AZIMUTH OF THE BOREHOLE, ROLL ANGLE OR TOOL FACE OF A DOWNHOLE DRILLER MOTOR, DOWNHOLE TEMPERATURE, DOWNHOLE PRESSURE GAMMA-RAY AND ELECTRIC CONDUCTIVITY OF DOWNHOLE FORMATION WHILE DRILLING, SIGNAL TRANSMITTERS, AND MUD PULSE TELEMETERS; GEOPHYSICAL AND GEOLOGICAL DEVICES FOR DRILLING OPERATIONS, NAMELY, SEISMOGRAPHS, MAGNETOMETERS, GRAVITY METERS, ACCELEROMETERS AND PARTS THEREFOR
37
DEEP WELL DRILLING FOR PRODUCTION OF NATURAL GAS AND CRUDE OIL; HORIZONTAL DRILLING OF THE HORIZONTAL UNDERPINNING OF EXISTING BUILDINGS, ROADS, RIVER COURSES, FOR LAYING ELECTRICAL AND TELECOMMUNICATIONS CABLES; DIRECTIONAL DRILLING SERVICES
42
TESTING WELL HOLES FOR LEAKS-OFF AND YIELD OF THE FORMATION; WELL HOLE SURVEYING AND NAVIGATING SERVICES FOR WELL HOLE DRILLING OPERATIONS; GEOPHYSICAL AND GEOLOGICAL MEASURING SERVICES, NAMELY, MEASURING CALIBER AND COURSE OF BOREHOLES, GAMMA-RAY, ELECTRIC CONDUCTIVITY AND STRENGTH OF BOREHOLE FORMATIONS
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