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3811857
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Patent number 3,811,857
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Issue date May 21, 1974
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C03 - GLASS MINERAL OR SLAG WOOL
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3107196
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Patent number 3,107,196
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Issue date Oct 15, 1963
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C03 - GLASS MINERAL OR SLAG WOOL
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1680681
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Patent number 1,680,681
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Issue date Aug 14, 1928
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C03 - GLASS MINERAL OR SLAG WOOL
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1559094
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Patent number 1,559,094
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Issue date Oct 27, 1925
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C03 - GLASS MINERAL OR SLAG WOOL