1976.	Established Nihon Protector Hanbai Co.,Ltd.
1974.	Developed and sold "NCV/ECV series", new Dropper Power Supply.
1970.	Incorporated as Nihon Protector Co.,Ltd. Developed and Sold DC Stabilized Dropper Power Supply "CV series".
1968.	Company changed its name to Nihon Protector.
1970.	Setsuo Sakai founded the Sakai Dengi Shokai. Developed reverse relay for protecting motors, "RS relay"