Ключевые слова: balcan stream, bucket, building, bulldozer, clay, construction, crane, dig, earthwork, earthworks, equipment, excavation, excavator, extraction, fuel, gas, gas main, gas supply, gaspipeline, hydraulic, line, machine, natural gas, oil, oil pipeline, oilfield, petroleum, pipe, pipeline, power, serbia, site, steel, structure, supply, technology, transportation, trench, tube, tubular, vehicle, welding, work, working, yellow,