when was copper first used
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when was copper first used
when was copper first used by humans
what was copper first used for
why was copper one of the first metals used
copper first used
when was the word copper first used
when was copper pipe first used
when was copper pipes first used for plumbing
when was copper first used, when was copper first used by humans, what was copper first used for, why was copper one of the first metals used, copper first used, when was the word copper first used, when was copper pipe first used, when was copper pipes first used for plumbing