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Cable tray protection system
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Patent number 4,433,732
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Issue date Feb 28, 1984
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Minnesota Mining and Manufacturing Company
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Richard R. Licht
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Intumescent sheet material
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Patent number 4,305,992
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Issue date Dec 15, 1981
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Minnesota Mining and Manufacturing Company
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Roger L. Langer
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D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
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Intumescent fire retardant composites
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Patent number 4,273,879
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Issue date Jun 16, 1981
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Minnesota Mining and Manufacturing Company
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Roger L. Langer
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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Offset laminated intumescent mounting mat
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Patent number 4,048,363
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Issue date Sep 13, 1977
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Minnesota Mining and Manufacturing Company
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Roger L. Langer
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C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES