| Arabian Oil Company, Ltd. | .Mitsui Oil Exploration Co. |
| ohsui Corporation | Nichiro Corporation |
| Hohsui | 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. |