Type 89 I-Go medium tank
The Type 89 medium tank I-Go (八九式中戦車 イ号, Hachikyū-shiki chū-sensha I-gō) is a medium tank used by the Imperial Japanese Army from 1932 to 1942 in combat operations of the Second Sino-Japanese War, at Khalkhin Gol against the Soviet Union, and in the Second World War. The Type 89B model was the world's first mass-produced diesel engine tank.