January 2004,Toei Electric System Co.,Ltd. was established by the capital 10 million yen. Starting business on serving construction of electric power, electric line and maintenance.
24 July 2008, Kantou Meintenance Co.,Ltd. had established for expansion the construction and maintenance business all over the Kanto area.
4 August 2015, Kantou Meintenance Asia Co.,Ltd.had established by the capital 10 million baht for split the work from Kanto Maintenance and expand eletric train’s electric system construction and maintenanace business to oversea expecially Asia countries.