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Refractory
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Patent number 4,557,884
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Issue date Dec 10, 1985
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Dresser Industries, Inc.
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Daniel R. Petrak
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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Nitride bonded oxide refractories
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Patent number 4,533,646
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Issue date Aug 6, 1985
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Dresser Industries, Inc.
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Ke-Chin Wang
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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Fused silica shapes
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Patent number 4,528,244
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Issue date Jul 9, 1985
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Dresser Industries, Inc.
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Howard M. Winkelbauer
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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Refractory
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Patent number 4,460,528
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Issue date Jul 17, 1984
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Dresser Industries, Inc.
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Daniel R. Petrak
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES