Sept. 1943: Mitsubishi Chemical Industries began processing of synthetic rubber at Feb. 1946: Nagahama Rubber Industries established for natural rubber processing. Apr. 1948: Became Japan's first company to June 1958: Ended rubber production and specialized in manufacture of plastic products. Renamed Nagahama Plastics Industries Ltd. July 1960: Moved to Tokyo from Nagahama City, Shiga.June 1961: Listed on Tokyo Stock Aug. 1961: Listed on Osaka Securities Exchange.Oct. 1961: Hiratsuka Plant began operation.June 1962: Renamed Mitsubishi Plastics Industries Ltd.Jan. 1974: Mine Plant began operation.June 1994: Renamed Mitsubishi Plastics, Inc. July 1994: Koriyama Plant began operation.
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