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Graphite material
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Patent number 8,367,196
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Issue date Feb 5, 2013
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Ibiden Co., Ltd.
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Toshiyuki Nishiwaki
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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3641991
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Patent number 3,641,991
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Issue date Feb 15, 1972
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B28 - WORKING CEMENT, CLAY, OR STONE
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3113564
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Patent number 3,113,564
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Issue date Dec 10, 1963
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B28 - WORKING CEMENT, CLAY, OR STONE