Ключевые слова: abstract, backdrop, background, bearings, business, classic, closeup, clutches, cog, cogs, concept, connect, connection, cooperation, design, differential, engineering, equipment, gear, gear shift, gearbox, gears, gearwheel, industrial, industry, interlock, machine, machinery, macro, mechanical, mechanics, mechanism, metal, metallic, motion, parts, planetary gear, precious, rotate, shine, spares, steel, success, team, technology, teeth, transmission, wheel,