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| 1969 Apr | Founded MEIOH PLASTICS INDUSTRIES in Naka-magome, Ota-ku,Tokyo |
| 1977 Aug | Change organization and company name to MEIOH PLASTICS MOLDING CO., LTD. |
| 1982 Nov | Opened TOHOKU FACTORY for expanding productive capacity |
| 1983 Jul | Established MEIOH ELECTRONICS CO., LTD. and started electronic-components assembly business |
| 1984 Jun | First extension for TOHOKU FACTORY for expanding productivity |
| 1985 Dec | Headquarter building was constructed and the head office was relocated |
| 1988 Jul | Factory area was doubled by the TOHOKU FACTORY second extension |
| 1989 Apr | Production engineering section was established and the insourcing for automatic machine was started |
| 2004 Dec | Increased capital to 30 million yen |
| 2005 Sep | Obtained ISO9001：2000 certification |
| 2006 Jan | Established TOHOKU SECOND FACTORY |