gyroscopes; inclinometers; magnetometers; modems; pressure sensors; scintillometers; surveying instruments; wellbore surveying instruments, namely, cable depth counters; temperature sensors; directional borehole steering tools, namely, directional compasses, inclinometers, clinometers, magnetic and electromagnetic location transmitters and detectors, and gyroscopically-oriented instruments, namely, gyroscopically oriented directional compasses, gyroscopically oriented inclinometers, and gyros...