Apparatus, instruments, and controls for use in oil and natural gas exploration, including drilling consoles, data acquisition systems, gas monitors and sensors, weight indicators, sensors, pressure indicators and gauges, pressure indicating systems, torque indicators, torque indicating systems, tachometer systems, meters, drilling recorders, pump stroke counters, pump speed indicators, rotary speed indicators, vertical drift recorders, pressure recorders, line monitors, tensiometers, hydraulic load cell systems, crane load indicators, and strain gauge load pins and load cells
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