| http://www.w3.org/ns/prov#value | - Besides such self-designed cementing, fracturing, sand-control and mixing equipments, we also supply a complete line of petroleum & gas upstream products, including drilling equipment & tools, work-over and production equipments, petroleum exploration equipment and instrument, rig & accessories, mud pump & fluid end parts, butterfly valves,solid control equipment (such as shale shaker, desander, D
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