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Electric ceramic composition
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Patent number 4,973,567
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Issue date Nov 27, 1990
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Sumitomo Metal Mining Company Limited
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Kazutoshi Matsumoto
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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Dielectric ceramics
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Patent number 4,830,995
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Issue date May 16, 1989
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Sumitomo Metal Mining Company Limited
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Kazutoshi Matsumoto
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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Dielectric ceramic
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Patent number 4,752,594
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Issue date Jun 21, 1988
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Sumitomo Metal Mining Company Limited
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Takehiro Hyuga
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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Dielectric ceramics
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Patent number 4,692,421
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Issue date Sep 8, 1987
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Sumitomo Metal Mining Company Limited
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Kazutoshi Matsumoto
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES