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- ACCA Networks Co., Ltd
- Adachi City
- All Nippon Airways Co., Ltd.
- ANA Information Systems Planning Co. Ltd.
- Bridgestone Corporation
- CHUKYORIKUUN Co., Ltd.
- DAIKIN INDUSTRIES, Ltd.
- IIJ Technology Inc.
- IT Frontier Corporation
- ITOCHU Cable Systems Corp.
- Life Care Partners Co., Ltd.
- Meiji Yasuda Life Insurance Company
- Mitsubishi Research Institute DCS Co., Ltd.
- Mitsui Knowledge Industry Co., Ltd.
- Mizuho Corporate Bank, Ltd.
- Nippon Car Solutions Co., Ltd.
- ORIX Computer Systems Corporation
- Resona Bank, Limited
- RIKEN, Japan
- Sumitomo Life Insurance Company
- Sumitomo Rubber Industries, Ltd.
- The Bank of Tokyo-Mitsubishi UFJ, Ltd.
- The Dai-Ichi Mutual Life Insurance Company
- The SANNO Institute of Management
- TOSHIBA Corporation
- UC Card Co., Ltd.
- UNIADEX, Ltd.
-NTT Group
- Nippon Telegraph and Telephone Corporation
- Nippon Telegraph and Telephone East Corporation
- Nippon Telegraph and Telephone West Corporation
- DOCOMO Technology, Inc.
- NTT Advanced Technology Corporation
- NTT Applie Corporation
- NTT BizLink, Inc.
- NTT Communications Corporation
- NTT COMWARE Corporation
- NTT DATA Corporation
- NTT DATA Net’s Corporation
- NTT Directory Services Co.
- NTT DOCOMO, Inc.
- NTT Electronics Corporation
- NTT Facilities, Inc.
- NTT Marketing Act Corporation
- NTT Rental Engineering Co., Ltd.
- NTT Resonant Inc.
(As of July 2008)
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