31 JULY 2009AL CIRCLE

China Gengsheng Minerals, Inc. Starts Trial Production of Fine <b>...</b>

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Jul 30, 2009 ... The abrasives are fine grains of silicon carbide, white fused alumina, and blend materials used in the cutting and polishing of optical ...

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China Gengsheng Minerals, Inc. Starts Trial Production of Fine <b>...</b>

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China Gengsheng Minerals, Inc. Starts Trial Production of Fine <b>...</b>

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