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Line 1: − <p align="center"><font color="#3F3F3F" size=3><br><br>3500 B.C. began w/ copper tools, then 2500 B.C. superior bronze tools, then 1200 B.C. superior iron tools.</font></p>+
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3500 B.C. began w/ copper tools, then 2500 B.C. superior bronze tools, then 1200 B.C. superior iron tools.