| 1933 |
Founded in Takamatsu, the company starts operation as silica sand mining company. |
| 1945 |
Company joins Co., Ltd. Organization and changes its name to Tsuchiyoshi Sangyo Shokai Co., Ltd. (Capital at the time
50,000 JPY) |
| 1950 |
Company opens once again after the war as Tsuchiyoshi Sangyo Shokai Co., Ltd. (Capital at the time 1,000,000 JPY) |
| 1957 |
Hiroshima Sales Office opened |
| 1966 |
Matsue Office Branch opened, Gotsu Factory opened |
| 1977 |
Takamatsu Tsuchiyoshi Co., Ltd., Hiroshima Tsuchiyoshi Co., Ltd., and Osaka Tsuchiyoshi Co., Ltd. were merged together
and Tsuchiyoshi Co., Ltd. was established (90,000,000 JPY) |
| 1988 |
Tsuchiyoshi Co., Ltd. and Tsuchiyoshi Sangyo Shokai Co., Ltd merged and become Tsuchiyoshi Co., Ltd. |
| 1995 |
Established joint venture with RCS Manufacture in Thailand |
| 2001 |
Tsuchiyoshi Sangyo Co., Ltd. established after it split from Tsuchiyoshi Industry Co., Ltd. |
| 2003 |
Obtained ISO14001 certification |
| 2004 |
Tsuchiyoshi Sangyo Co., Ltd., Tsuchiyoshi Co., Ltd./Matec, Tochu Co., Ltd., and Xin mei da (Taiwan) invested to
establish RCS Manufacture in Tianjin Yoshiazuma Casting Materials Co., Ltd. in Tianjin China. |
| 2007 |
Company capital reches 80 million JPY |
| 2009 |
Onan Research Center and Onan Nakago factory opened in Onan-cho, Onan-gun, Shimane Prefecture |
| 2012 |
Established Izumo Nakago Second Factory |
| 2014 |
Established Onan Factory. Sales company "PT.TSUCHIYOSHI HOSANA INDONESIA" established in Indonesia |
| 2015 |
Core Manufacturing company "PT.TSUCHIYOSHI PROCORE INDONESIA" established in Indonesia |
| 2017 |
"TSUCHIYOSHI INDUSTRY （THAILAND） CO.,LTD." established in Thailand |
| 2022 |
"TSUCHIYOSHI INDUSTRY USA, INC." established in U.S.A. |
