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(Based on Use)(Based on 44(e)) Electrical and electronic power control systems for use in connection with drilling apparatus and rigs for oil and gas exploration and production, namely, AC control modules, DC control modules, digital DC modules, digital frequency control modules, user consoles for use with control modules, power supply units, drilling power control systems, silicon controlled rectifiers, drilling silicon controlled rectifier systems, field regulator modules, firing pulse modules, foot throttle controls, meters for measuring physical characteristics such as temperature, pressure, flow and vibration in drilling apparatus and rigs, control consoles for use with mud pumps, training simulators for providing simulation of control modules or silicon controlled rectifiers, thyristors and varistors; electrical and electronic components for use in power control systems for use in connection with drilling apparatus and rigs for oil and gas exploration and production, namely, printed circuit boards including AC generator simulators, AC module dual engine switches, AC simulator cards, alarm PCBs, autosync display boards, autosync main boards, autosync power boards, battery chargers, CT drive PCBs, DC simulator cards, DC simulator sub boards, DIN rail isolated voltage feedback modules, diode auctioneering, drillers consoles, dynamic brake retrofits, field supply regulators, field voltage sensors, generator exciters, ground fault detectors, isolated voltage feedbacks, KW-KVAR unloads, LED logic indicators, LED riser boards, light firing boards, marine 12v power supplies, power limit 3 phases, power limit boards, relay converter boards, silicon controlled rectifier bridge for AC simulators, silicon controlled rectifier DC slides, silicon controlled rectifier field supply regulators, sprocket slip detectors, surge protection boards, surge suppressor boards, TFT display boards, variac control boards, variac LED boards, voltage dip detectors, voltage feedbacks, zener replacement boards; (Based on Use) Vibration-monitoring apparatus and devices and condition-monitoring apparatus and devices for use in oil and gas exploration and production(Based on Use) (Based on 44(e)) vibration monitors, metered monitors for measuring and monitoring temperature, pressure, flow, voltage and electrical current