- ASAHI GLASS Co., Ltd.
- ASAHI KASEI Corporation
- Babcock-Hitachi K.K.
- BAB-HITACHI INDUSTRIAL Co.
- CHIYODA CORPORATION
- CHUBU Electric Power Co.,lnc
- COSMO OIL CO., LTD.
- DAICEL CHEMICAL INDUSTRIES, LTD.
- DAIKIN INDUSTRIES, Ltd.
- EBARA CORPORATION
- Electric Power Development Co.,Ltd
- Hitachi, Ltd.
- Hokkaido Electric Power Co.,Inc.
- Hokuriku Electric Power Company
- IHI Corporation
- IDEMITSU KOSAN Co., Ltd.
- JAPAN ENERGY CORPORATION
- JFE Holdings, Inc.
- JGC Corporation
- KANSAI ELECTRIC POWER Co., Ltd.
- Kawasaki Heavy Industries, Ltd.
- Kobe Steel, Ltd.
- KYUSHU ELECTRIC POWER CO. INC.
- Maruzen Petrochemical
- Mitsubishi Chemical Corporation
- MITSUBISHI GAS CHEMICAL COMPANY.INC.
- MITSUBISHI HEAVY INDUSTRIES, LTD.
- Mitsubishi Rayon Engineering Co.,Ltd
- Mitsui Chemicals, Inc.
- MitsuiEngineering & Shipbuilding Co., Ltd.
- MIURA CO., LTD.
- Nippon Oil Corporation
- NIPPON PETROLEUM REFINING COMPANY,LIMTED
- Nippon Steel Corporation
- Shikoku Electric Power CO.,Inc.
- Shin-Etsu Chemical Co., Ltd.
- Sumitomo Chemical Co.,Ltd,
- Tohoku ElectricPower Co., Inc.
- Tokyo Electric Power Company, Inc.
- TonenGeneral Sekiyu K.K.
- TOSHIBA CORPORATION
- Tosoh Corporation
- Toyo Engineering Corporation
- Ube Industries, Ltd.
etc. ( Alphabetical, Titles omitted )