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Aluminum oxide based sintered body
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Patent number 5,858,899
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Issue date Jan 12, 1999
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NGK Spark Plug Co., Ltd.
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Jun Otsuka
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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Silicon nitride sintered body
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Patent number 5,049,531
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Issue date Sep 17, 1991
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NGK Spark Plug Co., Ltd.
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Kenji Nakanishi
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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Sintered silicon nitride products
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Patent number 5,032,554
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Issue date Jul 16, 1991
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NGK Spark Plug Co.
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Kenichi Mizuno
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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Silicon nitride sintered product
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Patent number 4,880,756
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Issue date Nov 14, 1989
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NGK Spark Plug Co., Ltd.
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Kazuhiro Urashima
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES