| Arabian Oil Company, Ltd. | Mitsui Oil Exploration Co. |
| Hohsui Corporation | Nichiro Corporation |
| Japex | Nippon Oil Exploration Co. |
| Kanzaki Forestry Co., Ltd. | Nippon Suisan Kaisha, Ltd. |
| Kawatetsu Mining Co., Ltd. | Nittetsu Mining Co., Ltd. |
| Kyokuyo Co., Ltd. | Takata Corporation |
| Maruha Corporation | Tokai Kogyo Co., Ltd. |
| Mindeco | Tsujino&Co., Ltd. |
| Mitsui Mining Co.，Ltd. |
责任编辑：mman
