History
Hissan Trading Co.,Ltd.
Rokko Shoji Co., Ltd.
Yamatomi Shoji Co., Ltd.
Kojima Co., Ltd.
Shimada Shoten Tokyo branch office opened.
1910
1916
Established Yamada Tomigoro hoten, a firewood fuel merchant, in Niigata City.
The head office was established in Nihonbashi, Tokyo, by Tokyo Hissan Shokai, a joint stock company. The business began by inheriting the Shimada Shokai Tokyo Branch Office, which has its head office in Osaka City.
1922
Merged with Tokyo Hissan Trading Co.,Ltd.
1932
1950
Kojima Shoji co., Ltd. was founded in Fukuoka City as a leather wholesaler.
Sanpei Co., Ltd. merged and changed its name to Hissan Trading Co.,Ltd.
1953
1954
Established Yamatomi Shoji Co., Ltd. and acquired the rights to sell products from Denka Cement co., Ltd. (currently Denka Co., Ltd.)
1960
Became an agent of Toyo Chemical Co., Ltd. (currently Denka Co., Ltd.)
Became an agent of Toyo Chemical Co., Ltd. (currently Denka Co., Ltd.)
Rokko Shoji Co., Ltd. was established in Taito-ku, Tokyo
1965
Became an agent of Tori Co., Ltd.
1969
Established Kojima Plastics Co., Ltd. in Fukuoka City with the management participation of Toyo Kagaku Co., Ltd. (currently Denka Co., Ltd.)
Opened Osaka branch in Tennoji-ku, Osaka
1972
Obtained management participation of Denki Kagaku Kogyo Co., Ltd. (currently Denka Co., Ltd.)
1973
Head office moved to Fukuoka City.
Head office relocated to Chiyoda-ku, Tokyo.
1974
1978
Head office moved from Niigata City to Chiyoda-ku, Tokyo.
Helios Co., Ltd. was established and started manufacturing and selling sewage treatment equipment.
1982
1985
Head office moved to Taito-ku, Tokyo.
Head office relocated from Kanda Kaji-cho to Kanda Ta-cho, both in Chiyoda-ku.
1986
1988～1997
● Established a joint venture company in Malaysia and a local subsidiary in Kuala Lumpur.
● Capital participation in Hong Kong companies and establishment of the Hong Kong office
● Established a local subsidiary in Shanghai.
1993
Head office was established in Fukuoka City, head office was relocated, and the company name was changed to Kojima Co., Ltd.
Head office moved to Shiba Park, Minato-ku, Tokyo.
1996
2000～2012● Opened offices in Shanghai and Hong Kong, and then established a local subsidiary.
● The Taiwan branch was established as a local subsidiary and more were opened in Singapore, India, Korea, and Indonesia.
2005
Become a wholly owned subsidiary of Denki Kagaku Kogyo Co., Ltd.(currently Denka Co., Ltd.)
2010
Head office moved to Bunkyo-ku, Tokyo.
2012
YK Inoas Co. Ltd.
Hissan Trading Co.,Ltd.
Rokko Shoji Co., Ltd.
Shimada Shoten Tokyo branch office opened.
1910
1916
The head office was established in Nihonbashi, Tokyo, by Tokyo Hissan Shokai, a joint stock company. The business began by inheriting the Shimada Shokai Tokyo Branch Office, which has its head office in Osaka City.
1922
Merged with Tokyo Hissan Trading Co.,Ltd.
1932
1950
Sanpei Co., Ltd. merged and changed its name to Hishimitsu Shoji Co., Ltd.
1953
1954
1960
1965
Rokko Shoji Co., Ltd. was established in Taito-ku, Tokyo
1969
1972
Opened Osaka branch in Tennoji-ku, Osaka
1973
1974
Head office relocated to Chiyoda-ku, Tokyo.
1978
1982
Helios Co., Ltd. was established and started manufacturing and selling sewage treatment equipment.
1985
1986
Head office relocated from Kanda Kaji-cho to Kanda Ta-cho, both in Chiyoda-ku.
1988～1997
● Established a joint venture company in Malaysia and a local subsidiary in Kuala Lumpur.
● Capital participation in Hong Kong companies and establishment of the Hong Kong office
● Established a local subsidiary in Shanghai.
1993
Head office moved to Shiba Park, Minato-ku, Tokyo.
1996
2000～2012
● Opened offices in Shanghai and Hong Kong, and then established a local subsidiary.
● The Taiwan branch was established as a local subsidiary and more were opened in Singapore, India, Korea, and Indonesia.
2005
Become a wholly owned subsidiary of Denki Kagaku Kogyo Co., Ltd.(currently Denka Co., Ltd.)
2010
Head office moved to Bunkyo-ku, Tokyo.
Merged and established
Akros Trading Co., Ltd.
Yamatomi Shoji Co., Ltd.
Kojima Co., Ltd.
1910
Established Yamada Tomigoro Shoten, a firewood fuel merchant, in Niigata City.
1916
1922
1932
1950
Kojima Shoji co., Ltd. was founded in Fukuoka City as a leather wholesaler.
1953
Established Yamatomi Shoji Co., Ltd. and acquired the rights to sell products from Denka Cement co., Ltd. (currently Denka Co., Ltd.)
1954
Became an agent of Toyo Chemical Co., Ltd. (currently Denka Co., Ltd.)
1960
Became an agent of Toyo Chemical Co., Ltd. (currently Denka Co., Ltd.)
Became an agent of Tori Co., Ltd.
1965
1969
Established Kojima Plastics Co., Ltd. in Fukuoka City with the management participation of Toyo Kagaku Co., Ltd. (currently Denka Co., Ltd.)
Obtained management participation of Denki Kagaku Kogyo Co., Ltd. (currently Denka Co., Ltd.)
1972
1973
Head office moved to Fukuoka City.
1974<
Head office moved from Niigata City to Chiyoda-ku, Tokyo.
1978
1982
Head office moved to Taito-ku, Tokyo.
1985
1986
1993
（平成5) 年
Head office was established in Fukuoka City, head office was relocated, and the company name was changed to Kojima Co., Ltd.
1996
2003
Certified as a Green Partner by Sony Corporation
2005
（平成17) 年
Head office moved to Bunkyo-ku, Tokyo.
2010
Merged and changed the company name to YK Inoas Co., Ltd.
2020
Akros Trading Co., Ltd. and YK Inoas Co. Ltd. merged in 2020
