| 1950 | Mar. | Sanbo Chemical Industry established as unincorporated joint-capital company in Yamamoto-cho, Sakai-shi |
|---|---|---|
| 1952 | Nov. |
Incorporated as Sanbo Chemical Industry Co., Ltd., with capital of ￥600,000 （President: Shigeaki Bessho） |
| 1959 | Oct. | Kannabe Plant established and starts operation |
| 1962 | Sep. | Production of intermediate pharmaceutical products commences at Kannabe Plant |
| Dec. | Head office moves from Yamamoto-cho to present location in Kannabe-cho | |
| 1968 | May | Research Grant for Important Technology received from the Regional Bureau of International Trade and Industry |
| 1969 | Jun. | Wakayama Plant established and commences operations in Kozaika, Wakayama Prefecture, Yamamoto Plant closed |
| 1976 | Jun. | Wakayama Plant acquires pharmaceutical manufacture license |
| 1978 | Jul. | Capital increased to ￥96 million |
| 1980 | Sep. | Subsidy received from the Small and Medium Enterprises Agency |
| 1981 | Nov. | Minoru Furukawa appointed President |
| 1984 | May | Research grant received from the Research Development Corporation of Japan |
| Jun. | Technology upgrade subsidy received from the Small and Medium Enterprises Agency | |
| 1985 | Mar. | Establishment of wholly-owned subsidiary, Sanbo Chemical K.K. Shizuoka Plant starts operation |
| 1989 | Nov. | Yoshiyuki Bessho appointed President |
| 1993 | Sep. | Sanbo Chemical K.K. merges with parent company, which thereby acquires the Shizuoka Plant |
| 1997 | Feb. | Shizuoka Plant receives ISO 9002 certification |
| 1998 | Apr. | Sakai Plant receives ISO 9002 certification |
| 2002 | Nov. | 50th anniversary of establishment |
| 2005 | Nov. | Wakayama and Sakai plants receive ISO 14001 certification |
| 2006 | May | Consignment for regional new consortium development business received from Kansai Bureau of Economy, Trade and Indusutry |
| Nov. | Consignment for joint research and development received from industry-academia-government consortium （City of Sakai and Osaka Prefecture University） | |
| 2007 | Nov. | Construction completed on new R&D wing on site of Sakai No.1 Factory |
| 2008 | Nov. | Main office section receives ISO14001 certification |
| 2009 | Jan. | Shizuoka Plant receives ISO 14001 certification |
| 2010 | Nov. |
Unified all ISO14001 system Yoshiyuki Ohashi appointed President |
| 2012 | Nov. | 60th anniversary of establishment |
| 2017 | May | Unified all ISO 9001 system |
| 2018 | Nov. | Kazumi Nejigaki appointed President |
| 2019 | Feb. | Saga Plant starts operation |
| 2021 | Nov. | Masataka Fujioka appointed President |
| 2022 | Nov. | 70th anniversary |
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