From left to right: A hand-operated circular bellows furnace, Santa Clara del Cobre, Mexico; a cast gold-and-copper-alloy lip plug (A.D. 1300–1521); a cast copper bell (A.D. 1300–1521) After they ...
Dozens of copper alloys are available as bearing materials. Most of these can be grouped into five classes: copper lead, copper tin (sometimes called tin bronze), leaded bronze, aluminum bronze, and ...
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