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Developed in 1929, the first Japanese tank with a diesel engine, which served as the main tank in the early 1930s. By the beginning of World War II, the design of the vehicle was already obsolete; however, it was widely used until the end of the war.
Variants
Type 89A I-Go KÅ / This design could attain only 15.5 km/h, and was also limited by the severe winter climate in northern China. A total of 113 tanks were produced.
Type 89B I-Go Otsu / The Ko was superseded in production from 1934 by the model Otsu with an air-cooled Mitsubishi A6120VD 120 hp diesel engine. The Type 89B Otsu version was the first mass-produced tank with a diesel engine.