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The Japanese conglomerate Hitachi manufactured aircraft engines from about 1929 until the end of World War II, with a concentration on low-power seven and nine cylinder radials and inverted inline fours. The Hitachi Aircraft Company was formed in 1939 to take over the aircraft and aero-engine branches of the Tokyo Gasu Denki K.K. or Tokyo Gas & Electric Co., Ltd. Many, if not most, Japanese military trainers were powered by Hitachi copies of German designed Hirth air-cooled inline engines. The Hitachi Hatsukaze powered the Kyushu K9W1 (Allied Code Name Cypress) Navy Type 2 Primary Trainer Model 11, and the similar Army version Kokusai Ki-86, Type 4 Primary Trainer aircraft. The engine was a derivative, licensed copy of the Hirth HM-504A, which powered the Bucker Bu 131 Jungmann aircraft. There were 541 Hatsukaze engines built during World War II between 1941 and 1943.