TOKYO ELECTRON DEVICE LIMITED is a company mainly engaged in the sale of semiconductor electronic parts. The Company has two business segments. The Semiconductors and Electronic Devices segment sells micro processors, memory integrated circuits (ICs) such as flash memories, custom ICs, general purpose ICs, specialty ICs, optical parts such as light-emitting diodes and photo couplers, as well as other electronics parts. The Computer Systems segment sells software, as well as storages and network equipments. As of March 31, 2015, the Company had seven subsidiaries, one associated company and one affiliated company.