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In OTL, Germany was initially allied to China, and switched sides to Japan in 1938. WI the Japanese-German cooperation had started much earlier, circa 1922? What technological transfers could have taken place until the end of WW2, and could German military doctrines have influenced Japanese ones at least to a limited extent?

In particular, since Japan was using chemical and bacteriological weapons on the Chinese front, could it have produced nerve agents such as tabun in strategically meaningful amounts? Could Germans have provided input on how to make better tanks and, more importantly, how to use them to optimal effect? Could they have advised to equip aircraft with self-sealing fuel tanks? In what other ways could this earlier cooperation have made a difference?
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