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Aviation

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  • $\begingroup$ Curiously - both bronze/brass and aluminium were scarce resources in WW2, but more-so for the central powers and Japanese. $\endgroup$
    – Criggie
    Commented Apr 29 at 22:29
  • $\begingroup$ Although the Japanese captured the major supplier of tin at the time (Malaysia), they did not have a domestic copper supply. However, the US and allies had to deal with (re)finding tin supplies. My grandfather, a mining engineer, spent WW2 in the Andes evaluating all the old mines for reopening to supply tin (and copper). $\endgroup$
    – Jon Custer
    Commented Apr 30 at 16:16