↑ "History". tokyometro.jp. Archived from the original on June 5, 2023. Retrieved July 13, 2024.
1 2 "東京都交通局,交通局について,都営地下鉄"[History of the Transportation Bureau]. kotsu.metro.tokyo.jp (in Japanese). Archived from the original on February 23, 2024. Retrieved July 12, 2024.
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