| 09/1960 |
Established Okada Rock Drill, Co. in Higashi-ku, Osaka and began sales, repair and assembly of pneumatic breakers and other construction machines. |
| 04/1962 |
Opened the Ogaki branch in Ogaki city, Gifu prefecture. |
| 07/1968 |
Opened the Tokyo branch in Kita ward, Tokyo. |
| 03/1969 |
Established the Shigino plant in Joto ward, Osaka city. |
| 02/1972 |
Opened the Sendai branch in Sendai City, Miyagi prefecture. |
| 02/1973 |
Established the Higashi Osaka plant in Osaka ward, Osaka prefecture and relocated the Shigino plant. |
| 04/1977 |
Launched hydraulic breakers on the market. |
| 03/1978 |
Opened the Nagoya branch in Nishi ward, Nagoya city. |
| 05/1980 |
Relocated the Tokyo branch (currently Tokyo headquarters) to Itabashi ward, Tokyo. |
| 09/1980 |
Opened the Morioka branch in Morioka city, Iwate prefecture. |
| 03/1983 |
Opened the Kanazawa branch in Kanazawa City, Ishikawa prefecture. |
| 09/1983 |
Changed the company name to OKADA AIYON CORPORATION. |
| 03/1986 |
Opened the Kyushu branch in Hakata ward, Fukuoka City. |
| 09/1986 |
Relocated the Morioka branch to Tonan village, Tsukuba district, Iwate prefecture. |
| 11/1986 |
Opened the Chubu branch in Ogaki City, Gifu prefecture and integrated the Ogaki branch and Nagoya branch. |
| 02/1987 |
Integrated the head office and Higashi Osaka plant and relocated the head office to Minato ward, Osaka City. |
| 10/1987 |
Started manufacturing and launched sales of Kowarikun, which is a new line of hydraulic breakers. |
| 04/1988 |
Relocated the Kyushu branch to Onojo City, Fukuoka prefecture. |
| 04/1989 |
Opened the Sapporo office in Nishi ward, Sapporo City. |
| 04/1990 |
Changed the name of Kanazawa branch to Hokuriku branch. |
| 07/1990 |
Opened the Hiroshima office in Asaminami ward, Hiroshima City. |
| 04/1992 |
Promoted the Sapporo office to a branch. |
| 08/1992 |
Listed on the Second Section of the Osaka Securities Exchange. |
| 04/1993 |
Promoted the Hiroshima office to a branch. |
| 04/1996 |
Opened the Yokohama branch in Tsuzuki ward, Yokohama City. |
| 04/1997 |
Opened the Shikoku branch in Matsuyama City, Ehime prefecture. |
| 05/1999 |
Established AMC Co., Ltd. (affiliated company). |
| 04/2001 |
Integrated the Kansai branch into the Osaka head office. |
| 02/2002 |
Established AIYON TECH. CO., LTD. and started manufacturing the TS-W series. |
| 07/2003 |
Acquired additional stock of AMC Co., Ltd. (affiliated company) to make it a subsidiary. Integrated the Hiroshima branch into the Kansai branch. |
| 10/2003 |
Merged with AMC Co., Ltd. (subsidiary). |
| 10/2005 |
Relocated and newly established AIYON TECH. CO., LTD. (subsidiary) to Asaka City, Saitama prefecture. |
| 04/2007 |
Opened an office in Hiroshima City, Hiroshima prefecture. |
| 10/2007 |
Relocated and newly established the Kyushu branch in Onojo City, Fukuoka prefecture. |
| 01/2008 |
Relocated and newly established the Morioka branch in Yahabacho, Shiwa district, Iwate prefecture. |
| 01/2011 |
Officially registered the TOP New S series in NETIS of the Ministry of Land, Infrastructure and Transport. |
| 04/2011 |
Integrated the Yokohama branch in Tsuzuki ward, Yokohama City into the Tokyo head office. |
| 05/2012 |
Relocated and newly established the Hiroshima branch in Hatsukaichi City, Hiroshima prefecture. |
| 07/2013 |
Listed on the Second Section of Tokyo Stock Exchange. |
| 11/2013 |
Newly reconstruction of Parts Center and Kansai branch. |
| 04/2015 |
Opened the Yokohama branch in Tsuzuki ward, Yokohama City. |
| 08/2015 |
Opened the Tokyo office in Kasumigaseki, Chiyoda ward. |
| 02/2016 |
Newly reconstruction of Aiyon Tech. Co., Ltd. Building. |
| 03/2016 |
Moved to the First Section of the Tokyo Stock Exchange. |
| 10/2016 |
Relocated and newly established the Hokuriku branch in Senkoujimachi, Kanazawa City. |
| 10/2017 |
The Nansei Machine Co.,Ltd., Nansei Wintech Co.,Ltd., and Akatsuki Kikou Co., Ltd. became group companies. |
| 04/2019 |
The three companies, The Nansei Machine Co.,Ltd., Nansei Wintech Co.,Ltd., and Akatsuki Kikou Co., Ltd. were integrated.
|
| 11/2019 |
Relocated and newly established the Shikoku branch in Iyogun, Ehime prefecture. |
| 10/2020 |
Relocated and renamed as Shonan branch in Hiratsuka City, Kanagawa prefecture. |
| 10/2021 |
Relocated and newly established the Hiroshima branch in Hiroshima City, Hiroshima prefecture. |
| 01/2022 |
Newly reconstruction of Chubu branch. |
| 04/2022 |
Relocated and newly established the Sendai branch in Miyagino-ku, Sendai City. |
