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1919 Minoji Hashiguchi establishes Kameido rubber factory in Tokyo
1920 Heisen Yoko chemicals division established at Kameido rubber factory with the purpose of importing and selling rubber
1921 Contract signed to act as agent for Bayer of Germany
1924 Heisen Yoko chemical division established as a joint stock company
Active in sales and publicity for Bayer's rubber additives as sole agent in Japan
1927 Approved as Asian agent for Bayer's rubber additives
Kobe office opened
1928 Rubber laboratory opened, along with department for training rubber technicians
1933 Heisen Yoko Chemical Division becomes a limited company
1939 Rubber research laboratory moved to Tokyo, facilities opened to facilitate development of the domestic rubber trade
1943 Chemical imports halted as a result of World War Two: business suspended
1950 Imports of Bayer rubber additives resumed after ratification of trade treaty with West Germany
Heisen Yoko Co Ltd established and Minoji Hashiguchi becomes managing director
1955 Agent for the introduction of Bayer's polyurethane technology, raw material sales begin
1956 Kansai sales office opened
1961 Minoji Hashiguchi passes away
1966 Fully owned subsidiary Koyo Sangyo Co Ltd established
1973 Joint venture with Impatex AG of Switzerland, H&K Ltd established, to manufacture polyurethane resin
1983 Nagoya sales office established
1995 Headquarters moved to Taito Ward in Tokyo
1998 Kansai sales office moved from Kobe to Osaka
2000 Kyushu branch established in Kita Kyushu City
2003 Environmental management system ISO14001 certification obtained
2011 Shanghai Rep.Office Opened
2012 Shanghai Rep.Office Closed
Heisen Trading(Shanghai)Co., Ltd. established