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! Time period !! Development summary
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| 1952–1985 || Nippon Telegraph and Telephone Public Corporation (NTTPC) prelude era. NTTPC is established as a corporation.
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| 1985–1992 || Nippon Telegraph and Telephone Corporation (NTT) prelude era. NTT is established as a private company.
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| 1992 onwards || {{w|NTT DOCOMO}} era, which is formally established taking over the mobile communications business of {{w|Nippon Telegraph and Telephone}} Corporation (“NTT Group”) as part of its corporate reorganization.<ref name="Careers at NTT DoCoMo">{{cite web |title=Careers at NTT DoCoMo |url=https://www.cleverism.com/company/ntt-docomo/ |website=cleverism.com |accessdate=12 November 2019}}</ref> In 1999, the company launches the world's first mobile Internet-services platform.<ref name="Overviewdd">{{cite web |title=Overview |url=https://www.nttdocomo.co.jp/english/corporate/about/outline/ |website=nttdocomo.co.jp |accessdate=15 October 2019}}</ref>
