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Gypsum board
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Patent number 5,116,671
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Issue date May 26, 1992
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Domtar, Inc.
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Robert Bruce
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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Gypsum board
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Patent number 5,085,929
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Issue date Feb 4, 1992
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Domtar Inc
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R. Bruce
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
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Organic gypsum set accelerators
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Patent number 4,298,394
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Issue date Nov 3, 1981
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BPB Industries Limited
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Peter A. Leeming
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES