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Kubota Corporation (株式会社クボタ Kabushiki-kaisha Kubota) is a tractor and heavy equipment manufacturer based in Osaka, Japan. One of its notable contributions was to the construction of the Solar Ark. The company was established in 1890. Kubota engines are in both diesel and gasoline or spark ignition forms, ranging from the tiny 0.276 liter engine to 6.1 liter engine, in both air-cooled and-liquid cooled designs, naturally-aspirated and forced induction.