日本製鋼所
After the adoption of the Type 74, the Japanese High Command was already looking for a superior, completely indigenous tank design to defeat the Soviet T-72. As a result, development of a prototype, the TK-X MBT began between 1976 and 1977. Joint development was performed by Mitsubishi Heavy Industries and TRDI (Japan Defense Agency's Technology Research and Development Institute). Major subcontractors included Japan Steel Works, Daikin Industries, Mitsubishi Electric, Fujitsu and NEC.