To be more specific, Kamado (cooking stove) was made in the Tohoku region mainly around 1955-1964; until then, various ingredients had been cooked in the Irori fireplace.
ちなみに北陸地方に竈（かまど）が作られるのは昭和30年代が中心で、それまではあらゆる煮炊きを囲炉裏で行なっていた。