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abstract, background, blade, blades, construction, electricity, energy, engine, engineering, equipment, factory, fuel, gas, gear, generator, heavy, industrial, industry, inside, iron, large, machine, machinery, manufacture, manufacturing, metal, motor, object, pipe, plant, power, powerplant, pressure, propel, repair, rotor, shiny, spinning, stainless, station, steam, steel, technical, technology, thermal, turbine, turbines, turbo, wind, workshop,