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By James F Carlin Jr Minerals Usgs Gov

Tin was one of the earliest-known metals.Because of its hardening effect on copper, tin was used in bronze implements as early as 3500 b.C.Bronze, a copper-tin alloy that can be sharpened and is hard enough to retain a cutting edge, was used during the bronze age in construction tools as well as weapons for hunting and war.The geographical separation between tin-producing and tin-consuming.

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