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| Asahi Diamond Industrial Co., Ltd. | IHI Corporation |
| KSK Needle Bearing Co., Ltd. | Oji Paper Co., Ltd. |
| Kawasaki Heavy Industries, Ltd. | Kubota Corporation |
| Kurimoto Iron Works Co., Ltd. | Kobe Steel, Ltd. |
| Komatsu Ltd. | Suncall Co., Ltd. |
| JFE Steel Corporation | SHOWA CORPORATION |
| Shoda Zoki Co., Ltd. | Shin-nippon Steel Corporation |
| Daido Steel Co., Ltd. | Daihatsu Motor Co., Ltd. |
| Chuo Spring Co., Ltd. | TPR Co., Ltd. |
| Nisshin Steel Co., Ltd. | Nippon Paper Industries Co., Ltd. |
| NIPPON THOMPSON CO., LTD | NHK Spring Co., Ltd. |
| Fuji Heavy Industries Ltd. | Mitsubishi Paper Mills Ltd. |
| Mitsubishi Heavy Industries, Ltd. | Murata Spring Co., Ltd. |
| Meiji Rubber Chemical Co., Ltd. |
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