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Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity; apparatus for recording, transmission or reproduction of sound or images; magnetic data carriers, recording discs; automatic vending machines and mechanisms for coin-operated apparatus; cash registers, calculating machines, data processing equipment and computers; fire-extinguishing apparatus.
modular measurement-while-drilling bottom hole assembly, consisting primarily of a bi-directional communication and power module and an electronic sensor module generally having a central processor, data memory and a plurality of sensors for making directional, drilling and formation measurements, namely, direction, temperature, bore and annular pressure, formation density, porosity, resistivity, vibration, stick/slip, gamma ray and other drilling system or formation evaluation measurements, that is used for directional drilling and formation evaluation in subterranean oil, gas, water, mineral and geothermal cell formations