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1955 Kyoritsu is established at its current location in Chiyoda-ku, Tokyo and forms business alliances with Philips Duphar (Netherlands), Welcome Foundation (U.K.), Pitman-Moore (U.S.) and Coopers (U.K.) .

1969 Kyoritsu begins vaccine production.
Nippon Calmic Ltd. is established.

1972 Aesop Pharmaceuticals Ltd. is established.

1989 Kyoritsu forms a business alliance with Masterfoods (U.S.).

1997 T-Cell Research Institute Ltd. is established.

2001 Kyoritsu changes its name to “Kyoritsu Seiyaku Corporation”.
2005 Kyoritsu starts an export business toward Asian countries.
2010 Kyoritsu fully integrates with Kawasaki Seiyaku K.K. as of June 1.
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