Ключевые слова: adult, arm, armature, big, blue, caucasian, chemical, closeup, control, engineer, engineering, factory, fittings, fixtures, fuel, gas, gasoline, gate, hands, human, industrial, industry, maintenance, male, man, metal, oil, oxygen, person, petrochemical, pipe, pipeline, plant, refinery, rotate, service, steel, supply, tap, technology, tube, turning, valve, vent, water, white, work, worker,