Oil company
company involved in production and distribution of petroleum products
Harbour Energy
Conoco Inc.
Gulf Oil
Sunoco
Elf Aquitaine
Hoyer
Repsol
Nabors Industries
Black Stone Minerals
American Petroleum Company
International Petroleum Company
Anglo-Persian Oil Company
Eg3 Combustibles S.A.
national oil company
ARCO
Chevron Corporation
CLASSIC
Sakhalin Energy
Amoco
Exxon
Atlantic Petroleum
Clark Brands
Creole Petroleum Corporation
El Paso Natural Gas Company
Europa
Gilmore Oil Company
Irkutsk Oil Company
Gulf Oil LP
National Iranian Oil Company
Lucas Oil
Petromin Corporation
Puma Energy
Quaker State
Shell Gas & Power
Tidewater Petroleum
Humble Oil