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2475915
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Patent number 2,475,915
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Issue date Jul 12, 1949
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C03 - GLASS MINERAL OR SLAG WOOL
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2422482
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Patent number 2,422,482
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Issue date Jun 17, 1947
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C03 - GLASS MINERAL OR SLAG WOOL
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2228010
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Patent number 2,228,010
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Issue date Jan 7, 1941
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C03 - GLASS MINERAL OR SLAG WOOL
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1721983
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Patent number 1,721,983
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Issue date Jul 23, 1929
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C03 - GLASS MINERAL OR SLAG WOOL
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1664154
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Patent number 1,664,154
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Issue date Mar 27, 1928
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C03 - GLASS MINERAL OR SLAG WOOL