Helmerich & Payne, Inc. is an American contract drilling company engaged in oil and gas well drilling and related services for exploration and production companies headquartered in Tulsa, Oklahoma, with operations throughout the world. Their FlexRigs, introduced in 1998, have been used extensively in drilling unconventional formations, such as the
[pdf] Cat Rotary Blasthole Drill Rigs offer substantial technology, efficiency and productivity improvements to efficiently reach your mining targeted productivity rates. Learn more about our mining drills here.
[pdf] NOV's two main predecessors, Oilwell Supply and National Supply, were founded in 1862 and 1893, respectively. These two companies manufactured and distributed pumps and derricks. In 1930, acquired Oilwell Supply. In 1958, merged with National Supply. In 1987, National Supply merged with USS Oilwell to become "National Oilwell". Varco was founded as Abegg and Reinhold Company by Walter Abegg and Baldwin Reinhold i.
[pdf] 
