|1980||CHOSHU is founded by Kaname Okamoto as a manufacturer and distributor of residential equipment. (Capital:\70million)|
|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.