Ключевые слова: air force, cleaning, close, closeup, concept, engineering, equipment, flange, force, hand, holding, industrial, industry, inspection, job, machine, maintenance, male, man, manhole, mechanic, mechanical, metal, nut, opening, petrochemical, pipeline, plant, pressure, refinery, repair, repairman, safety, screw, service, shop, tank, team, teamwork, technician, technology, tighten, tightening, tool, vessel, work, worker, workshop, wrench,