| September 1951 | Established Sanyo Metal Industry Co., Ltd. at 2-169 Kujominami, Nishi-ku, Osaka |
|---|---|
| February 1952 | Construction of factory at the same location |
| May 1960 | Established new head office building in Nishi-ku, Osaka |
| January 1964 | Capital increased to 15 million yen New construction of the first plant at 155 Oihara 4-chome, Yao City, Osaka Prefecture (current location) and relocated the plant. |
| February 1967 | New construction of the second factory and warehouse |
| May 1971 | New construction of the third and fourth factories |
| May 1989 | New construction of office and product warehouse |
| October 1989 | Installation of a heat treatment furnace (non-oxidizing continuous annealing furnace) |
| October 2003 | Obtained ISO 9001 certification |
| January 2006 | New construction of Kyushu factory |
| October 2008 | Expansion of material warehouse |
| September 2011 | Established Chubu factory |
| September 2016 | Consolidation of Kyushu factory equipment into the head office factory |
| March 2020 | Capital increased to 60 million yen |
| August 2020 | Installation of centerless polishing machine |
| November 2021 | Chubu Factory, second factory completed. |
| December 2022 | IHQT mass production commences. |