when was copper created
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when was copper created
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when did people start using copper
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history of copper metal
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when was copper created, when was copper discovered date, when was copper first discovered, when was copper first used, when did people start using copper, what year was copper discovered, when was copper age, when did the copper age begin, date copper was discovered, where was copper first found, history of copper metal, when did copper age start, what is copper origin, where did copper originate, who discovered copper and when, copper history of discovery