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3807980
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Patent number 3,807,980
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Issue date Apr 30, 1974
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C03 - GLASS MINERAL OR SLAG WOOL
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3687649
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Patent number 3,687,649
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Issue date Aug 29, 1972
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C03 - GLASS MINERAL OR SLAG WOOL
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3677729
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Patent number 3,677,729
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Issue date Jul 18, 1972
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C03 - GLASS MINERAL OR SLAG WOOL
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3674454
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Patent number 3,674,454
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Issue date Jul 4, 1972
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C03 - GLASS MINERAL OR SLAG WOOL
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3632321
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Patent number 3,632,321
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Issue date Jan 4, 1972
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C03 - GLASS MINERAL OR SLAG WOOL
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3627491
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Patent number 3,627,491
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Issue date Dec 14, 1971
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C03 - GLASS MINERAL OR SLAG WOOL
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3486995
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Patent number 3,486,995
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Issue date Dec 30, 1969
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C03 - GLASS MINERAL OR SLAG WOOL