when was copper discovered
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when was copper discovered
when was copper discovered date
when was copper discovered in europe
when was copper discovered as an element
how was copper discovered
when was copper first discovered
when and where was copper discovered
how was copper first discovered
when was copper discovered and by who
when was copper discovered, when was copper discovered date, when was copper discovered in europe, when was copper discovered as an element, how was copper discovered, when was copper first discovered, when and where was copper discovered, how was copper first discovered, when was copper discovered and by who