Input (grade 7): It is a direct descendant of John D. Rockefeller's Standard Oil company, and was formed on November 30, 1999, by the merger of Exxon and Mobil.
Output (grade 9): It was created when Exxon and Mobil, both companies formed after the John D. Rockefeller's original Standard Oil company split apart, joined together in a merger to become one company.