In 1929, Cooper became the Cooper-Bessemer Corporation when it merged with Bessemer Gas Engine Company, which was founded in Grove City, Pennsylvania in 1899.

Two years later, it moved its headquarters to Houston and in 1968 began the Cooper Rolls joint venture with Rolls-Royce to market gas turbines.

Ajax Repair & Supply, General Turbine Systems, PDQ Machine, and certain assets of Enox Technologies were acquired and combined into Cooper Energy Services.

[10] In June 2013, Cameron and Schlumberger announced that OneSubsea, a joint venture to manufacture and develop products, systems and services for the subsea oil and gas market, has received all required regulatory approvals.

[11] On January 20, 2014, Cameron announced that its reciprocating compression division, (Cooper-Bessemer Corp's last direct descendant) would be purchased by GE Oil and Gas, and would be in the Downstream Technologies Solutions business unit.

[12] In April 2016, oilfield services company Schlumberger completed the acquisition of Cameron International for $14.8 billion, in a combination of stock and cash.

[14] In December, 2011, Cameron agreed to pay a $250 million settlement to BP PLC to settle all claims related to the Deepwater Horizon[15] without admitting responsibility.