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| Position holders | |||
|---|---|---|---|
| Holder | Start date | End date | |
| Masato Watanabe Politician | |||
| Tamotsu Shinotsuka Politician | |||
| Naoki Ito Politician | |||
| Shinichi Saida Politician | - | ||
| Shirō Sadoshima Politician | |||
| Masato Watanabe Politician | |||
| Masayuki Inoue Politician | |||
| Naoki Ito Politician | |||
| Shirō Sadoshima Politician | |||
| Kiminori Iwama Politician | - | ||
| Kiminori Iwama Politician | - | ||
| Tamotsu Shinotsuka Politician | |||
| Masayuki Inoue Politician | |||
| Shinichi Saida Politician | - | ||