National Oilwell Varco, Inc. (NOV) is a provider of equipment and components used in oil and gas drilling and production operations, oilfield services, and supply chain integration services to the upstream oil and gas industry. The Company operates in three segments. The Rig Technology segment designs, manufactures, sells and services systems for the drilling, completion and servicing of oil and gas wells. The Petroleum Services & Supplies segment provides a variety of consumable goods and services used to drill, complete, remediate and workover oil and gas wells, service pipelines, flowlines and other oilfield tubular goods. The Distribution Services segment provides maintenance, repair and operating (MRO) supplies, and spare parts to drill site and production locations worldwide.On April 21, 2008, NOV acquired Grant Prideco, Inc. In December 2008, it acquired Sakhalin Outfitters LLC and Mid-South Machine, Inc. In April 2009, NOV acquired ASEP Group Holding B.V. and Anson Limited.