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3362806
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Patent number 3,362,806
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Issue date Jan 9, 1968
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C03 - GLASS MINERAL OR SLAG WOOL
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2551311
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Issue date May 1, 1951
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C03 - GLASS MINERAL OR SLAG WOOL
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1689048
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Patent number 1,689,048
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Issue date Oct 23, 1928
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C03 - GLASS MINERAL OR SLAG WOOL
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469790
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Patent number 469,790
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Issue date Mar 1, 1892
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F27 - FURNACES KILNS OVENS RETORTS