Precision Plugs, 113 Lochwood Pl, Yukon, OK 73099, US

Scientific Drilling International pioneered downhole navigation systems in 1969 by offering the first commercial steering-tool, the 'EYE'. Since then, the company has developed cutting-edge systems for survey, production logging, wellbore navigation and directional drilling. Through Scientific Drilling, magnetic ranging and high-end memory production tools have been introduced, including the world s first memory pulsated neutron-logging system. Since the late 1960 s, Scientific Drilling has been at the forefront of survey technology by offering solutions for its demanding market. Scientific Drilling is the only company to offer survey/steering systems across the technology spectrum from the simplest of film systems to the latest high accuracy continuous multi-gyro inertial systems. Scientific Drilling International maintains a location in Oklahoma City, Okla.