| Nov. 1976 |
Joined Chuo Accounting Firm |
| Aug. 1980 |
Registered as a certified public accountant |
| July 1986 |
Founded Kubokawa CPA Office, (currently Yotsuya Partners Accounting Firm), representative partner (to present) |
| Mar. 1987 |
Registered as certified tax accountant |
| Feb. 1989 |
Corporate auditor of SOFTBANK Corp. Japan (currently SOFTBANK) (to present) |
| May 2003 |
Corporate auditor, KASUMI Co., Ltd. (to present) |
| June 2004 |
Corporate auditor, TAKE AND GIVE. NEEDS Co., Ltd. (to present) |
| June 2005 |
Corporate auditor, KYORITSU PRINTING CO., LTD. (to present) |
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