Ключевые слова: axle, black, bucket, cable, carbon, chain, construction, crane, derrick, dig, digging, dragline, earthen, energy, equipment, excavate, excavation, excavator, greasing, heavy, leverage, machine, machinery, memories, mining, old, physics, pollution, power, powered, pulley, scoop, servicing, shovel, simple, steam, surface, triangles, wheel, winch,