Kabushiki Kaisha NTT Dēta

• Haishutsuryō torihiki tō ni kakaru haishutsuwaku no kōritsuteki kanri ni kansuru chōsa kenkyū hōkokusho
• Heisei 25-nendo jishu sankagata kokunai haishutsuryō torihiki ni kakaru denshi shisutemu no un'yō, iji kanri jigyō itaku gyōmu hōkokusho