While in 1941 japan researches some techs of 1940 and one of 1941 it has still not begun to research the 1938 carriers. It appears that japan has a much to low priority on carriers. Or maybe it is just a much to high priority on almost everything else? If japan is supposed to be at least some challange for the USA japan needs the 1941 carrier tech for better carriers and especially the better cags.
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