Ключевые слова: abstract, assembly, background, blue, circle, close, closeup, cog, cogs, cogwheel, cold, concept, connect, connection, design, detail, engine, engineering, equipment, factory, gear, gears, industrial, industry, iron, machine, machinery, mechanical, mechanism, metal, metallic, motion, motor, moving, oil, old, part, parts, power, precision, process, rotating, steel, technology, teeth, transmission, turn, wheel, wheels, work,