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3809544
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Patent number 3,809,544
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Issue date May 7, 1974
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C03 - GLASS MINERAL OR SLAG WOOL
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3754885
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Patent number 3,754,885
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Issue date Aug 28, 1973
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C03 - GLASS MINERAL OR SLAG WOOL
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3563718
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Patent number 3,563,718
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Issue date Feb 16, 1971
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C03 - GLASS MINERAL OR SLAG WOOL
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3264079
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Patent number 3,264,079
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Issue date Aug 2, 1966
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C03 - GLASS MINERAL OR SLAG WOOL
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2708813
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Issue date May 24, 1955
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C03 - GLASS MINERAL OR SLAG WOOL