Ключевые слова: alloy, background, brass, camshaft, closeup, cog, cogwheel, complexity, construction, dark, dirty, energy, engine, engineering, equipment, gear, grunge, industrial, industry, innovation, instrument, machine, manufacture, mechanism, metal, metallic, motor, movement, object, oil, old, part, rust, rusty, screw, shaft, spring, steel, technology, valve, vehicle,