| 1980 | CHOSHU is founded by Kaname Okamoto as a manufacturer and distributor of residential equipment. (Capital:\70million) |
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| 1981 | Solar water heaters, bathtub heaters, hot water systems are released. |
| 1984 | Engineers are dispatched to NEC Anelva Corporation to learn cutting-edge vacuum technology. |
| 1985 | CHOSHU forms a business tie-up with NEC Anelva Engineering on vacuum mechatronics. CHOSHU is designated as an affiliated factory by NEC yamaguchi. |
| 1993 | Hiroshima factory launches operations on cleaning service in Mihara, Hiroshima. |
| 1996 | Mechatronics equipment factory (Building B) launches operations in Sanyo, Yamaguchi. |
| 1997 | Hiroshima factory is certified for ISO9002. |
| 1998 | Solar photovoltaic systems are released. |
| 1999 | Mechatronics equipment factory is certified for ISO9001. |
| 2000 | Building for vacuum equipment factory and administration (Building A) launches operations in Sanyo, Yamaguchi. (It is renamed to Vacuum and Mechatronics equipment factory.) |
| 2007 | Head office is relocated to vacuum and mechatronics equipment factory. (It is renamed to Head office/factory) High-tech and environmental equipment factory (Building C) launches operation. |
| 2009 | Solar photovoltaic division is certified for ISO9001. Production for photovoltaic module of multicrystalline A series is started. |
| 2010 | CHOSHU participates PV Japan 2010 at Pacifico Yokohama. Production for photovoltaic modules of monocrystalline B series is started. 3MW solar modules are delivered to Fukuyama Solar Power Plant of Chugoku Electric Power Co., Inc. |
| 2011 | Solar photovoltaic cell production factory (Building D) is completed at Head office/factory. |
| 2012 | Production for photovoltaic modules of monocrystalline C series is started with Independently developed 156mm full-square cells. An integrated production system from silicon ingot pulling to photovoltaic module assembly is established. |