9 ELECTRONIC APPARATUS FOR MEASURING DIRECTIONAL AND HORIZONTAL DRILLING DATA, NAMELY, TOOL FACE, AZIMUTH, AND DRIFT ANGLES, DURING A DRILLING OPERATION
42 TECHNICAL RESEARCH AND CONSULTING SERVICES, NAMELY, ANALYSIS, INSPECTION, TESTING, RESEARCH, AND ENGINEERING STUDIES, ENGINEERING AND CIVIL ENGINEERING SERVICES, GEOLOGIC TECHNIQUES AND ESTIMATES, ALL IN THE FIELD OF DRILLING OPERATIONS