Ключевые слова: background, circle, closeup, cog, cogwheel, concept, connect, conversion, coupling, detail, element, engine, engineering, equipment, gear, gearbox, gearing, gold, industrial, industry, iron, machine, machinery, mechanic, mechanical, mechanism, metal, metallic, metalworking, motion, old, part, pinion, power, precision, reducer, rotation, round, screw, spare parts, spares, steel, teamwork, technical, technology, teeth, tool, transmission, wheel, work,