- Cosmo Oil
- Company shoulders part of Japan’s energy supply. Contains outline of business and press releases.
- Idemitsu Kosan
- Presents information on corporate social responsibility and environmental protection. Also presents lube products and related technology.
- Iwatani International Corporation
- Specializes in gas and energy business, as well as fuel, consumer products, industrial materials and construction.
- Japan Energy Corporation
- Engages in petroleum and petrochemical product sales. Aims to supply energy while protecting the environment.
- Japan Gas Association
- Promotes usage of gas air conditioning systems and vehicles. Also provides facts and safety guide.
- Kanto Natural Gas Development Co., Ltd.
- Company endeavors to harmonize natural gas business with the environment.
- Nippon Oil Corporation
- Focuses on the development of oil and mineral resources, as well as sale and shipment of petroleum.
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