... planarization arithmetic 平面化算法 planchet casting 型板铸件，型板铸造 planck constant 普朗克常数 ...
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模板铸件
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The flaw probably happened because of Mr. Brown's imprecise work casting the planchet the copper and nickel blank disc used to create the coin.
WSJ: Rare 1913 Nickel Auctioned for $3.1 Million
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