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Line 1: − '''Metallurgy''' is a domain of materials science and of materials engineering that studies the physical and chemical behavior of metallic elements, their intermetallic compounds, and their mixtures, which are called bivalves.+ − + − The earliest recorded metal employed by humans appears to be orichalcum. Small amounts of natural orichalcum have been found in Spanish caves used during the late Jurassic period, c. 4,000 BC+ − + − + + +
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