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| 1947 |
Company founded for the production of tobacco flavors. |
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| 1948 |
Acquisition of Maeno Factory (later renamed as Maeno Works). |
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| 1952 |
Started production of Glycine, Isoniazid, Nicotinicacid. |
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| 1956 |
Started operation at the Hasune Factory (now the Tokyo Research Laboratory). |
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| 1960 |
Started production of 2-vinyl pyridine. |
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| 1961 |
Head office moved to Kyobashi, Cyuo-ku. Production of Glycine and β-Alanin started by new process. |
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| 1962 |
Company name changed to Yuki Gosei Kogyo Co.,Ltd. Listed on the Tokyo Stock Exchange 2nd Section. |
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| 1963 |
Started production of Triacetin. |
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| 1964 |
Established Joban Factory. |
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| 1972 |
Inauguration of Tokyo Research Laboratory. |
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| 1977 |
Started production of 3-amino pyridine. |
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| 1978 |
Started production of DNA. |
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| 1984 |
New multi-purpose plant at Joban Factory built. |
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| 1986 |
Started production of 4-aminopyridine. |
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| 1990 |
New refinery plant for pharmaceutical intermediates built at Joban Factory; Capital increased to 2,550million yen. |
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| 1991 |
Head office moved to Hirakawa-cho, Cyiyoda-ku. |
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| 1992 |
Multi-purpose small scale plant built at Joban Factory. |
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| 1995 |
Head office moved to Nihonnbashi-Ningyocho, Chuo-ku; Process Development facilities completed at Joban Factory. |
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| 1996 |
ISO (international Organization for Standardization) 9002 certified on Joban Factory.
Production plant of Grignard and silicon compounds built.
Capital increased to 3,471 million yen. |
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| 1998 |
New production plant for clinical supplies built at Joban Factory. |
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| 1999 |
ISO 14001 certified on Joban Factory. |
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| 2004 |
Listed on the Tokyo Stock Exchange 1st Section. |
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| 2006 |
Dusseldorf Office & YGK USA INC. (Princeton,NJ) established.
New cyanopyridine plant (CP-Ⅲ) built at Joban Factory.
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| 2007 |
LNG boiler plant built at Joban Factory. |
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