| 1908 |
Established as "Yamamoto Seisakusho Limited Company" in Shinbashi, Minato-ku Tokyo |
| 1935 |
Established as "Yamamoto Press Industry Limited Company." |
| 1958 |
Closed "Yamamoto Press Industry Limited Company" and newly established "Yamamoto Press Seisakusho Co., Ltd." in Maeno-cho, Itabashi-ku,Tokyo |
| 1980 |
Established "Sunstone Industry Co., Ltd." in Nasukarasuyama City, Tochigi Prefecture |
| 1998 |
Established "Sunstone Products (Fujian) Co., Ltd." in Changle, Fujian, China |
| 2005 |
Established "Yamamoto (Fuzhou) Press Seisakusho Co., Ltd." in Fujian, China |
| 2005 |
Established a stone sales company "Sunstone Sales Co., Ltd." |
| 2006 |
Yamamoto Press Seisakusho Co., Ltd. merged with Sunstone Industry Co., Ltd. and newly established stamping department in Tochigi (stone processing) factory |
| 2008 |
Established "Technology Development Department" in Minami Tokiwadai, Itabashi-ku,Tokyo |
| 2013 |
Established "YS Precision Stamping,Inc." in Kentucky, U.S.A. |
| 2014 |
Invested in Sugawa Industry (Thailand) Co., Ltd. and changed the company name to "YS Precision Stamping (Thailand) Co., Ltd." |
| 2014 |
Sugawa Kogyo Co., Ltd. participated in the capital and changed the company name from Yamamoto (Fuzhou) Press Seisaku Co., Ltd. "Fuzhou Yamamoto Sugawa Press Seisaku Co., Ltd." |
| 2018 |
Moved the Technology Development to Maeno-cho, Itabashi-ku,Tokyo |
| 2022 |
Established TY Tech Center Co., Ltd., a joint company with Tomei Diamond Co., Ltd. |
