Though most famously run by former Vice President Dick Cheney, Halliburton Energy Services was run by Thomas H. Cruikshank during the 80s and early 90s.  What was their primary area of operation?
Halliburton The Halliburton Company, an American multinational corporation. One of the world's largest oil field service companies, it has operations in more than 70 countries. It owns hundreds of subsidiaries, affiliates, branches, brands, and divisions worldwide and employs approximately 50,000 people.
Summa Corporation Summa Corporation was the name adopted for the business interests of Howard Hughes after he sold the tool division of Hughes Tool Company in 1972. The tool division would merge with Baker International in 1987 to form Baker Hughes, the world's third-largest oil-services company. The name "Summa", Latin for "highest", was allegedly chosen by several of Hughes' employees without consulting him first. Hughes was allegedly dissatisfied, and preferred the name "HRH Properties" - with the initials standing for both "Howard Robard Hughes" and "Hughes Resort Hotels". His suggestions were never implemented, and the company remained Summa for 18 years following Hughes' death.