Ключевые слова: background, bit, bore, borer, boring, carbide, chisel, closeup, cone, construction, cutter, cutting, drill, drilling, engineering, equipment, exploration, fuel, gas, gasoline, hard, hole, industrial, industry, instrument, isolated, metal, milling, mining, mobility, natural, oil, part, petroleum, platform, rig, rock, roller, section, steel, technology, teeth, tool, torque, tricone, tungsten, turning, well, white, work,