Idemitsu Oil Development Co., Ltd.
Japan Drilling Company(JDC)
Japan National Oil Corporation(JNOC)
Japan Petroleum Exploration Co., Ltd.(Japex)
Kanto Natural Gas Development Co., Ltd.
Nippon Mining Co., Ltd.
Teikoku Oil Company(TOC)
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Drico Co., Ltd.
Geothermal Research & Development(GERD)
Idemitsu Geothermal Co., Ltd.
Japan Metal & Chemicals(JMC)
Kagoshima Chinetsu Co., Ltd.
Mitsubishi Material Co., Ltd.
Mitsui Mineral Development Engineering Co., Ltd.(Mindeco)
Nichibo
Nichiju Kaihatsu Co., Ltd.
Nittetsuko Consultant Co., Ltd.
Ote Kaihatsu Co., Ltd.
SK Engineering(SKE)
Teiseki Drilling CO., Ltd.
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Akema Boring Co., Ltd.
Asahi Geo Survey Co., Ltd.
Dia Consultants Co., Ltd.
Fuji Boring Co., Ltd.
Geophysical Surveying & Consulting Co., Ltd.
Niigata Engineering CO., Ltd.
Nippon Steel Co., Ltd.
Nihon Kohatsu Co., Ltd.
Ogushi Drilling Co., Ltd.
Ohara Iron Works
Telnite
Tokyo Geological Industries Co., Ltd.
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