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abstract, barrel, beam, big, blue, cad, design, dimensions, drawing, electricity, energy, engineering, equipment, facility, factory, fuel, gas, gasoline, heat, heavy, industrial, industry, insulation, iron, line, manufacturing, metal, mineral, oil, pairs, pipe, pipeline, piping, plant, power, pump, reflection, resources, sewage, shine, stainless, steel, technology, tube, valve, wide angle,