1. Again, Japan does not have the technological background nor the resources to be innovating. Paper production was somewhat limited, iron was of low quality, gun powder had not developed to the point needed. What people in general are ignoring is that what works needs the backing of technology behind it, and without such technological infrastructure, what can work would not work. This is a basic thing any person knowledgeable in technological development would understand.
2. Barbed wire is only possible with the technology needed to make long steel wires, which again isn't possible at this era, especially Japan.
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