Ключевые слова: activity, background, building, business, cone, construction, conveyor, crane, crusher, dust, duty, earth, environment, equipment, excavation, excavator, extraction, factory, gravel, heap, heavy, industrial, industry, loading, machine, machinery, manufacturing, material, metal, mine, mineral, open, outdoors, outside, pebble, pit, processing, quarrel, quarry, quarrying, rock, rubble, sand, saw, sorting, stone, technology, transportation, truck, work,