Ключевые слова: 40, abstract, background, barrel, black, blue, business, cad, concrete, design, designer, energy, engineer, engineering, equipment, estate, factory, fuel, gas, heavy, illustration, industrial, industrialplant, industry, insulation, line, machine, manufacturing, metal, oilindustry, pairs, pipe, pipeline, piping, plant, power, pressure, production, pump, rubiks cube, shine, sketch, stainless, steel, supply, technology, tube, valve, worker, workshop,