Ключевые слова: aged, antique, arrangement, binding, blue, bolt, bonding, circle, clock, clockwork, closeup, cog, cogs, cogwheel, connection, cooperation, engine, engineering, equipment, gear, gearwheel, gold, hardware, industrial, industry, inside, instrument, machine, machinery, macro, mechanical, mechanism, metal, old, part, progress, reliability, retro, sprockets, steel, teamwork, technical, technology, time, toned, turn, twist, unity, watch, wheel,