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| April 1st, 2010 | |
| Products have been updated. For details, please see "Overview of operations" shown above. |
| July 1st, 2009 | |
| Company Outline have been updated. Please see "Company Outline" shown above. |
| April 1st, 2008 | |
| We established a new company and changed our corporate name to Sumitomo Metal Mining Engineering Co., Ltd. For details, please see "Company Outline" shown above. |
| April 1st, 2008 | |
| Details of Head Office and branches have changed. For details, please see "Company Outline" shown above. |
| April 1st, 2008 | |
| Operation contents have been updated. Please see Overview of operations shown above. |

