Ключевые слова: aged, arrangement, binding, blue, bolt, bonding, circle, clock, clockwork, closeup, cog, cogwheel, connection, engine, engineering, equipment, gear, gears, grunge, hardware, industrial, industry, machine, machinery, macro, mechanical, mechanics, mechanism, metal, metallic, old, part, progress, reliability, retro, rotation, sprockets, steel, teamwork, technical, technology, time, together, toned, turn, twist, unity, vintage, watch, wheel,