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When did they decide to change the inside of a penny to zinc

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The inside of a penny changed to zinc around late 1982. Due to copper prices, they believed that it would save over $50 million/yr [ Source: http://www.chacha.com/question/when-did-they-decide-to-change-the-inside-of-a-penny-to-zinc ]
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When did they decide to change the inside of a penny to zinc?
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The inside of a penny changed to zinc around late 1982. Due to copper prices, they believed that it would save over $50 million/yr
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