| Achilles Corporation |
Nippon Mukj Co., Ltd. |
| Arisawa Manufacturing Co., Ltd. |
Nippon Sheet Glass Co., Ltd. |
| Asahi Fiberglass Co., Ltd. |
Nippon Silica Glass Co., Ltd. |
| Asahi Glass Co., Ltd. |
Nitta Industries Corp. |
| Aso Cement Co., Ltd. |
Nok Corporation |
| Bando Chemical Industries Ltd. |
Noritake Co., Limited |
| Bridgestone Corporation |
Saint-Gobain Norton Kk. |
| Chichibu Onoda Cement Corporation |
Sakura Rubber Company Ltd. |
| Fujimi Inc. |
Sanwa Kenma Kogyo Co., Ltd. |
| Inax Corporation |
Sec Corporation |
| Inoac Corporation |
Sumitomo Metal (Smi) Electronics Devices Inc. |
| Kinsei Matec Co., Ltd. |
Sumitomo Osaka Cement Co., Ltd. |
| Krosaki Harima Corporation |
Sumitomo Rubber Industries |
| Lafarge(法国拉法基) |
Taiheiyo Cement Corporation |
| Michelin Okamoto Tire Co. |
The Ohtsu Tire &. Rubber Co., Ltd. |
| Molten Co. |
The Yokohama Rubber Co., Ltd. |
| Narasaki Sangyo Co., Ltd. |
Tokai Carbon Co., Ltd. |
| Ngk Insulators, Ltd. |
Tokai Rubber Industries, Ltd. |
| Ngk Spark Plug Co., Ltd. |
Toshiba Ceramics Co., Ltd. |
| Nichias Corporation |
Toto Ltd. |
| Nihon Cement Co., Ltd. |
Toyo Glass Co., Ltd. |
| Nihon Yamamura Glass Co., Ltd. |
Toyo Tire &. Rubber Co., Ltd. |
| Nippon Electric Glass |
Yoshino Gypsum Co., Ltd. |
| Nippon Glass Fiber Co., Ltd. |
|