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Installation, maintenance, and repair of elevators, escalators, light machinery, construction machinery, industrial instrumentation, mill control equipment, motors, generators, pumps, compressors, precision machine tools, power tools, automotive systems, transformers, circuit breakers, electrical switches, physical security and identification systems, train traffic control systems, railway signals, materials handling equipment, computers, computer servers, computer hardware, industrial personal computers and programmable controllers, inverters, servo drive systems, and speed changers, nuclear power plants, hydroelectric power plants, thermal power plants, substations and power conversion equipment, environmental control equipment, chemical plants and equipment, transportation systems, industrial plants, refrigeration equipment, air conditioning equipment and water purifying apparatus