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| 1985 || May 30 || Early development || Nippon Telegraph and Telephone Corporation (NTT) launches as a privatized joint stock corporation operating domestic telecommunications.<ref name="fundinguniverse.com"/><ref name="docomo-sys.co.jp">{{cite web |title=History |url=https://www.docomo-sys.co.jp/english/company/history.html |website=docomo-sys.co.jp |accessdate=12 September 2019}}</ref><ref>{{cite book |last1=Takano |first1=Yoshirō |title=Nippon Telegraph and Telephone Privatization Study: Experience of Japan and Lessons for Developing Countries, Parts 63-179 |url=https://books.google.com.ar/books?id=3aW1AAAAIAAJ&q=Nippon+Telegraph+and+Telephone+Corporation+in+1985&dq=Nippon+Telegraph+and+Telephone+Corporation+in+1985&hl=en&sa=X&ved=0ahUKEwj9memH44bmAhXlD7kGHQ7IAWMQ6AEITzAF}}</ref>
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| 1989 || || Early development || {{w|NTT DOCOMO}} commences operation of Nagoya Regional Marketing Branch.<ref name="docomo-sys.co.jp"/>
