发明授权
US4370164A Yellow metal alloy 失效
黄金属合金

Yellow metal alloy
摘要:
An alloy of about 4 to 10% gold, silver, copper, palladium, indium, zinc and boron producing an alloy with a pleasing yellow color. Tarnish resistance, wear resistance and heft are similar to 10 karat gold with a lesser cost due to the low gold content.
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